PASSENGER CAR AND TRUCK IDENTIFICATION

Model and Year 1984 MODELS

This bulletin has been prepared to assist in identifying 1984 model vehicles and components as described below:

SUBJECT PAGE ------- ---- Vehicle Identification Number . . . . . . . 2 - 4

Fisher Body Plate . . . . . . . . . . . . . 5

Corvette Body Plate . . . . . . . . . . . . 6

Light Duty Truck Service Parts Identifica- tion Sticker . . . . . . . . . . . . . . . 6

1984-85 Service Parts Identification Label Locations . . . . . . . . . . . . . . . . . 7

Engines . . . . . . . . . . . . . . . . . . 8 - 13

Transaxles . . . . . . . . . . . . . . . . 14

Transmissions . . . . . . . . . . . . . . . 15 - 26

Axles . . . . . . . . . . . . . . . . . . . 27 - 37

PASSENGER CAR VEHICLE IDENTIFICATION NUMBER

The vehicle identification number is visible through the windshield near the left door. On all passenger cars, except Corvette, it is stamped on a plate located on the instrument panel. On Corvettes, it is on the left windshield pillar.

LIGHT DUTY (10-30) TRUCK VEHICLE IDENTIFICATION NUMBER

"C", "K", "G", "S" and El Camino trucks display the VIN plate on the left hand side of the instrument panel area. On P 42 models, the plate is attached to the top of the radiator support, and on Motor Home Chassis P 32, to the dash and toe panel.

MEDIUM DUTY TRUCK VEHICLE IDENTIFICATION NUMBER

On Conventional Cabs, the VIN plate is mounted on the left door lock pillar. on School Bus Chassis, the plate is attached to the engine side of the cowl. On "P" models, it is located on top of the radiator support panel.

BODY IDENTIFICATION PLATE

On the Chevrolet, El Camino and Monte Carlo, the body identification plate is located on the upper horizontal surface of the cowl plenum chamber. The Cavalier, Celebrity, Camaro, Citation and Chevette plate is located on the upper horizontal surface of the radiator support.

CORVETTE BODY PAINT AND TRIM PLATE

The body paint and trim plate which is stamped with the trim, paint and time built codes is attached to the left door hinge pillar.

LIGHT DUTY TRUCK SERVICE PARTS IDENTIFICATION STICKER

A Service Parts Identification Sticker is furnished for L.D. trucks except El Camino. It contains a complete listing of the vehicle identification number (VIN) wheel base and all production options used to assemble the vehicle, such as suspension, body equipment, engine, axle, transmission, tires, etc.

On "C-K", "G" and "S" models, this sticker is attached to the inner glove compartment. For "P" models, it is mailed separately to the dealer. On "G" models, the sticker is located on the inner hood panel surface.

1984-85 SERVICE PARTS IDENTIFICATION LABEL LOCATIONS

The body plates will be phased out plant by plant beginning at start of production 1984. Rather than using body plates, the plants will install Service Parts Identification Labels at the following locations:

Carline Body Style Location ------- ---------- --------- Celebrity All Exc. Wagon Panel Assembly - Spare Tire Cover

Wagon Left Rear Stowage Compt. - Back Wall

Impala/ All Exc. Wagon Rear Deck Lid - Inner Caprice Classic Wagon Rear Load Floor Cover

Camaro All R.R. Console Compartment Dr. Monte Carlo All Rear Deck Lid Inner

Cavalier All Panel Assembly Spare Tire Cover

Chevette All Panel Assembly Spare Tire Cover

Citation All Panel Assembly Spare Tire Cover

Corvette All R.R. Floor Compartment & Door Assembly

PASSENGER CAR ENGINE PRODUCTION CODE EXPLANATION

Chevrolet produced engines will be stamped with a source, production date and engine suffix. Other General Motors produced engines used in Chevrolet vehicles will use a label affixed to the engine assembly.

CHEVROLET ENGINE PRODUCTION CODE

EXAMPLE:

------- V 12 10 DWB - -- -- --- ENGINE MONTH DAY ENGINE SOURCE PRODUCED PRODUCED CODE ------ -------- -------- ---- K=GM of Canada 12th Month 10th Day Chevrolet 1.6L F=Flint Motor December (98 CID L4) T=Tonawanda V=Flint Engine M-GM of Mexico A=Ramos - Mexico

ENGINE CODE LOCATIONS

L4 1.6L ------- The code is stamped on a pad on the right side of the engine below the number one cylinder parallel to the cylinder case deck.

L4 2.0L ------- The engine suffix and build date is steel stamped on a horizontal machined surface on the left rear side of the cylinder case under the exhaust manifold.

L4 2.5L ------- The code is on a sticker placed on the timing gear cover and is also stamped on the block, water pump end, just below the cylinder head. This is a three letter alpha-numeric code indicating engine type.

V6 2.8L ------- The code is stamped on a horizontal machined surface on the block just forward of the intake manifold.

V6 3.8L 231 CID (Front Mounted Distributor) ------------------------------------------- Located on the front face of the R.H. cylinder head on a paper label. Also traceability label on inboard side of L.H. rocker arm cover.

V6 3.8L 229 CID (Rear Mounted Distributor) ------------------------------------------ Stamped on cylinder case pad immediately forward of the right cylinder head.

V6 4.3L 262 CID (Diesel) ------------------------- Label located on rear of L.H. rocker arm cover.

V8 5.7L 350 CID (Diesel) ------------------------ The code is on a label located on flat surface on L.H. rocker arm cover.

V8 5.0L and 5.7L ----------------- Stamped on cylinder case pad immediately forward of the right cylinder head.

NOTICE: In addition, all passenger car engines (except 3.8L 231 CID) will have a portion of the vehicle identification number stamped near the engine production code, usually near the right hand side of the cylinder case. This condensed identification number consists of the division number, model year, assembly plant designation and vehicle build sequence number.

EXAMPLE:

------- 1 E R 1 2 3 4 5 6 - - - ----------- Chevrolet Model Assembly Vehicle Passenger Year Plant Sequence (VIN Pos. 3) Number

1984 PASSENGER ENGINE CODES

DISPLACE- FEDERAL AND HIGH ALT. CALIFORNIA VEHICLE MENT R.P.O. AUTO. MANUAL AUTO. MAN. ------- ---- ------ ------ ------ ----- ----- T 1.6L L17 SWJ SWK SWM SWR SWJ SWK SWR SWN CHEVETTE SWN SWS SWT SWN SWS SWS 1.8L LJ5 DJB DJD DJA DJC SKC (DIESEL) SKB DMT DMR SKA J 2.0L LQ5 SRH SRJ SRF SRB SRW CAVALIER SRC SRD

A 2.5L LR8 Z3J Z5C Z3J Z5C CELEBRITY (TBI) 4.3L LT7 UAM ULX UAP UAS UCB UDN ULZ ULY UMB UDP 2.8L LE2 SCS SCV

X 2.5L LR8 Z3L Z3K Z3L Z3K CITATION 2.8L LE2 SC3 SCT 2.8L LH7 SFR SFS SFM SFN F 2.5L LQ9 Z3H Z3F Z5F Z3H Z3F Z5F CAMARO 2.8L LC1 SAD SAC 5.0L LG4 SDN SDR SDN SDR 5.0L L69 SUJ SUH SUJ G 3.8L LC3 SBA SBC Mt. CARLO SBF SBJ 3.8L LD5 FWA FRA 5.0L L-69 SUF SXA 5.0L LG4 SDH SDJ SDH SDJ 5.7L LF9 RAN RAP RAT "B" 3.8L LC3 SBA SBC CHEVROLET SBF SBJ 3.8L LD5 FWA 5.0L LG4 SDA SDU SDS SDA 5.7L LM1 SUN SUN 5.7L LF9 RAA RAB RBL RBM RAF Y 5.7L L83 ZFC ZFD ZFF ZFN CORVETTE (TBI)

DISPLACE- CANADA PRO. VEHICLE MENT AUTO. MAN. DIV. ------- ---- ----- ---- ---- T 1.6L T4A T4C T4B T4D CHEV. CHEVETTE T4F 1.8L IZ

J 2.0L C2T C2U C2W C2D CHEV. CAVALIER

A 2.5L Z3J Z5C PONT. CELEBRITY 4.3L UAM ULX UAP OLDS ULY 2.8L C6D C6F CHEV. C5M C5A MEXICO X 2.5L Z3L Z3K PONT CITATION 2.8L C5K C5S C5D C5C CHEV. 2.8L C5H C5F CHEV.

F 2.5L Z3H Z3F Z5F PONT. CAMARO 2.8L C3B C3D C3A C3C CHEV. 5.0L C4D C4C CHEV. 5.0L G 3.8L CHEV. Mt. CARLO 3.8L F2A BUICK 5.0L 5.0L C4B 5.7L RAN RAP OLDS

"B" 3.8L SBA SBC CHEV. CHEVROLET SBF SBJ 3.8L F2A BUICK 5.0L C4A C4W CHEV. 5.7L CHEV. CBN POLICE 5.7L RAA RAB OLDS RBL RBM

Y 5.7L CHEV. CORVETTE ZFH ZFJ

TRUCK ENGINE PRODUCTION CODE EXPLANATION

Chevrolet produced engines, except 6.2L diesel will be stamped with a source, production date and engine suffix. Other General Motors produced engines used in Chevrolet vehicles will use a label affixed to the engine assembly.

CHEVROLET ENGINE PRODUCTION CODE

EXAMPLE:

-------- F 12 10 USC - -- -- --- Source Month Day Engine Code Code Code Type ---- ---- ---- ---- K=GM of Canada 12th Month 10th Day F=Flint Motor December T=Tonawanda V=Flint Engine M=GM of Mexico R=Moraine

NOTICE: In addition, all 10-30 Series Trucks have a portion of the vehicle identification number stamped near the engine production code, usually near the right hand side of the cylinder case. This identification number consists of the division code, model year, assembly plant designation and vehicle build sequence number.

EXAMPLE: C C F 1 2 3 4 5 6 ------------------

The truck engine codes are located as follows:

L4 2.0L 112 CID Rear Wheel Drive -------------------------------- The engine suffix and build date is steel stamped on a horizontal machined surface on the left rear side of the cylinder case under the exhaust manifold.

L6 250 CID

The engine suffix and build date is steel stamped on a horizontal machined surface on the right side of the cylinder case adjacent to the distributor shaft.

V8

305, 350 CID Engines - the code is stamped on the cylinder case pad immediately forward of the right hand cylinder head.

366, 427, 454 CID Engines - the code is stamped on a pad on the front top center of the cylinder case immediately forward of the inlet manifold.

V8 Diesel

6.2L (379 Cubic In.) -------------------- Identification label attached to rocker covers.

EXAMPLE:

-------

10 UTW R 0004441 -- --- - ------- Engine Suffix Plant Build Assembly Code Sequence

For product reports use suffix, plant code and sequential number, i.e. - UTWR 4441.

1984 LIGHT DUTY TRUCK ENGINE CODES

DISPLACE- FEDERAL AND HIGH ALT. CALIFORNIA VEHICLE MENT R.P.O. AUTO. MAN. AUTO. MAN. ------- ---- ------ ------ ---- ----- ----- "S" 1.95L LRl FZJ FZK FZR FZS FZM FZH S-10TRUCK 2.2L LQ UMU FZW 2.0L LQ2 FWA FWB FWC FWD FKD FKA FKB FKH 2.8L LR2 FYB FYD FYA FYC FYH FYS FVF FYR FYK FYN FYJ FYM "T" 2.0L LQ2 FWM FWN FWW FWX T-10 TRUCK 1.95L LRl FZT FZU 2.8L LR2 FYU FYX FYT FYN FYZ FZH FYY FZF FZB FZD FZA FZC C-K-P 4.8L L25 FTM FTR FTN FTS 10-30 4.1L LE3 FAH FAL FBX FAJ FAK FAN FAB FAD FAC FAM L. D. TRUCK FAR 5.0L LE9 FCD FCH FCN FCC FCF FCK FCM FDD FDH FDN FDC FDF FDK FDM 5.0L LF3 FDA 5.7L LS9 FRC FRF FRB FRD FRA FSH 5.7L LT9 FRH FSD FSB FSA FSF FSC 5.7L LP9 FFB FFA 7.4L LE8 FBD FBF FBK FBH FBJ FBS FBU FBW FBR FBT 6.2L LH6 FHD FHJ FHB FHL FHF FHH FHC (DIESEL) FJB FJH FHF FJF FJC FJM FJR FJN FJK FJJ FJS MILITARY FJA "G" 10-30 VAN 5.0L LE9 FCT FDT FCR FCS FDR FDS 5.0L LF3 FDB 4.1L LE3 FAS FAU FAW FAX FAB FAT FAY FBA FBB FBC LS9 FRJ FRK LT9 FSJ FSM FSK FSN LL4 FHW FHT FHS FHK FHN FHY FHT FHS FHM FHY FHZ "P" 5.7L LT9 FRN FSS FSR FSW FRR FSW FSZ FST FSY 20-30 FSX L. D. TRUCK 6.2L LL4 FJX FJY FJT FJU FJW FJX FJY FJT FJU FJZ FFN 7.4L LE8 FBS FBU FBR FBT FBD FBF FBK FBH FBJ FBW FBM 4.8L L25 FTB FTC FTD FTA

DISPLACE- CANADA PRO. VEHICLE MENT AUTO. MAN. DN. ------- ---- ------ ---- ---- "S" 1.95L IZU S-10TRUCK 2.2L IZU 2.0L CHEV.

2.8L CHEV.

"T" 2.0L CHEV. T-10 TRUCK 1.95L 2.8L CHEV.

C-K-P 4.8L CHEV. 10-30 4.1L CHEV. L. D. TRUCK 5.0L CHEV.

5.0L CHEV. 5.7L CHEV. 5.7L T5B T5A CHEV. 5.7L CHEV. 7.4L CHEV. 6.2L FHD FHB DDA

MILITARY "G" 10-30 VAN 5.0L CHEV. 5.0L CHEV. 4.1L CHEV.

CHEV. T5C CHEV. FHW FHT FHK DDA FHS "P" 5.7L CHEV. 20-30 L. D. TRUCK 6.2L FJX FJY FJT DDA FJW 7.4L CHEV.

4.8L MEX.

1984 MEDIUM DUTY TRUCK ENG. CODES --------------------------------- ALL STATES CANADA ENG. AUT. MAN. AUT. MAN. MAN. ---- ---- ---- ---- ---- ---- 7.0L ACA ACB ACF A8F A8H A8D CHEV. L-43

6.0L AAU AAW, AAX A8B A8C A8A CHEV. L-86 AAK AAT AAM

TRANSAXLE ASSEMBLY IDENTIFICATION INFORMATION

The manual and automatic transaxle each has its own code location and explanation.

MANUAL TRANSAXLE

Four Speed 76MM

The code is stamped on a diagonal case surface directly beneath the clutch lever cable reaction bracket.

The Muncie 76mm stamp consists of two (2) alpha and three (3) numeric characters as shown below:

EXAMPLE:

------- X 4 A 04 - - - -- Mfg. Source Calendar Code Model Year Month Produced Day Produced

X = Muncie 4 = 1984 A=Jan. K=July 01 = 1st Day B=Feb. M=Aug. of Month C=Mar. P=Sept. 04 = 4th Day D=Apr. R=Oct. of Month E=May S=Nov. H-June T=Dec.

AUTOMATIC TRANSAXLE

THM 125C Three Speed Automatic

The code is located on a stamped metal tag adjacent to the shifter shaft on the transaxle.

The stamp is in one of two formats as shown below, depending on manufacturing location:

Willow Run, U.S.A. -------------------- 84 CV 8711 -- -- ---- Model Year Vehicle Application Sequence Code Number

Windsor, Canada

J 222 A 4CB - --- - ---- Source Julian Shift Model Number (Windsor) Build Date

PASSENGER CAR TRANSMISSION PRODUCTION CODE EXPLANATION

Manual Transmissions

Four-speed transmissions built at Chevrolet plants will carry a production code number. The code number identifies the source, model year, month and day produced.

The transmission codes are located as follows:

Four-Speed

The Muncie (cast iron case) transmission (Saginaw type) is stamped on the machined surface of the left side of the case just below the side cover.

The Muncie 70mm (aluminum case) transmission is stamped on the bottom center front of case.

EXAMPLE:

-------- K 4 R 03 - - - -- MODEL MONTH DAY SOURCE CODE YEAR PRODUCED PRODUCED ----------- ---- -------- --------

A-January B-February C-March K=Muncie (Chevette, 70mm D-April 4-Speed) E-May H-June R=Muncie (Passenger 4-Speed K-July Saginaw Type) M-August P-September R-October S-November T-December

Warner Gear Four and-Five-Speed Manual Transmissions

The manual transmission code, part number and serial number, appears on a metal tag attached to an extension housing bolt on the left side (8 o'clock position).

EXAMPLE TAG:

Customer P/N 14078525 WA2041 Source Code

Source P/N 13-52-062 21975 Sequential Serial Number

EXAMPLE

W A 20 4 1 - - -- - - SOURCE CODE MONTH DAY YEAR CODE ----------- ------ --- ---- ---- W = Warner A-Jan. G-July 20=20th 4 = Shift B-Feb. H-Aug. Day 1984 Produced C-Mar. J-Sept. D-Apr. K-Oct. E-May L-Nov. F-June M-Dec.

Four-Speed Manual With Automatic Overdrive (Doug Nash) MK2

Source trademark appears above speedo gear opening.

The Doug Nash transmissions have the source code, model year, unit serial number and ratio identification stamped on two (2) metal tags. One (1) tag is attached to the T-10 transmission side cover lower bolt, and the other tag is on the overdrive pan front bolt.

EXAMPLE: D 4 C 25 037 - CD

D 4 C 25 037 C D - - - -- --- - - SOURCE CODE YEAR MONTH DAY SERIAL NUMBER RATIO P/N ----------- ---- ----- --- ------------- ----- ---- D=Doug Nash 4=1984 A=Jan. 25=25th 37=37th Unit B=Feb. Day Built C=Mar. D=Apr. E=May F=June G=July H=Aug. J=Sept. K=Oct. L=Nov. M=Dec.

The tag on the T-10 transmission has an additional code.

EXAMPLE D 4 C 25 037 - CD

X A B Part Number Ratio Assembly Drawing

Chevette Five Speed Isuzu Transmission

Right side of transmission case at rear extension is a six digit ink stamp transmission serial number. On right side of bell housing at approximately 4:00 o'clock position, five digit ink stamp.

3 02 18 - -- -- Last Digit of Year Month Date

Five Speed Isuzu Manual Transaxle (MY7)

On fifth gear cover ten digit die stamped number.

3 05 15 0 0 0 1 Last Digit of Year Inspection Month Inspection Date Blank Serial Number

Automatic Transmissions

THM 180C Automatic Transmission

The THM 180C automatic transmission code and transmission serial number appears on a metal tag fastened to the left side of the transmission just rearward of the converter housing.

THM 200C Automatic Transmission

The identification tag is located on the right side of the transmission case and includes the model year, application code and sequence number.

EXAMPLE:

84 OU 6991 -- -- ---- Model Year Vehicle Sequence Number Application Code

THM 200-4R Automatic Transmission

The identification tag is located on the right side of the transmission case and includes the model year, application code, build date code and the sequence number.

EXAMPLE:

84 BY 201 0346 -- -- --- ---- Model Year Vehicle Application Build Date Sequence Code Code Number

THM 250C and 350C Automatic Transmissions

THM 250C and 350C transmissions produced by Chevrolet Parma have the production code stamped on the governor cover.

EXAMPLE B 4 D 10 D - - - -- - MODEL MONTH DAY SHIFT SOURCE CODE YEAR PRODUCED PRODUCED PRODUCED ------------ ---- -------- --------- -------- B = Parma (THM 250C) 1984 A = Jan. 10th Day D = 1st B = Parma (THM 350C) B = Feb. N = 2nd C = March D = April E = May H = June K = July M = Aug. P = Sept. R = Oct. S = Nov. T = Dec.

THM 440-T4 Four Speed Automatic

The code is located on a stamped metal tag on the rear face of the transaxle case adjacent to right hand axle opening.

An example of the identification tag is shown below:

THM 700-4R Automatic Transmission

The identification number is stamped into right rear oil pan rail. The format includes the year, model, Julian build date and shift.

EXAMPLE 4 YA 222 D - -- --- - MODEL JULIAN YEAR NO. BUILD DATE SHIFT ---- ---- ----------- ----- D = Day N = Night

PASSENGER CAR TRANSMISSION IDENTIFICATION NUMBER FOR "SERVICE" USAGE

The following system will be used to identify service transmission assemblies. This number system applies to domestically produced complete service transmission assemblies only. Transmission cases are no longer identified. Manufacturing plants will number each service assembly as it is produced. The first letter will designate the GM division which produced the unit - "C" (Chevrolet). The second letter will indicate the type of unit "T" (transmission). The number following the letter will designate the model year - "4" (1984). The last five digits specify the service replacement sequence number. The group of numbers to be used by Chevrolet Manufacturing plants are as follows:

PLANT SERIAL SEQUENCE ----- ---------------

Chevrolet - Parma Transmission Plant 00001 to 14999

Chevrolet - Muncie Transmission Plant 25000 to 44999

EXAMPLE: Number CT400175 designates Chevrolet transmission, year and 175th unit produced for service at Parma.

Upon completion of the serial sequence, the plant will reuse the above numbers using a letter prefix, such as A, B and C.

EXAMPLE: CT4A00175

Hydra-Matic Division 00001 to 99999

Hydra-Matic Division transmissions will be numbered with the letter "H" regardless of the GM division using the transmission.

1984 PASSENGER CAR TRANSMISSION PROGRAM SUMMARY

PROCESSING NUMBER MANUAL 4-SPEED

MK2 2.88:1 First Gear Ratio - Automatic Overdrive Doug Nash M17 3.31:1 First Gear Ratio, Transverse Muncie M26* 3.50:1 First Gear Ratio Muncie M19 3.53:1 First Gear Ratio, Transverse Muncie MY8 3.53:1 First Gear Ratio, Transverse Muncie MY1 3.75:1 First Gear Ratio Muncie

MANUAL 5-SPEED

MK4 3.50:1 First Gear Ratio Borg Warner MK6 2.95:1 First Gear Ratio Borg Warner MK5 3.50:1 First Gear Ratio Borg Warner MB4 3.76:1 First Gear Ratio Borg Warner M75 3.79:1 First Gear Ratio Isuzu MY7 3.91:1 First Gear Ratio, Transverse Isuzu

AUTOMATIC 3-SPEED

MD9 125c, Converter Clutch,Transverse Willow Run - Hydra-matic MD2 180c, Converter Clutch Strausbourg MV9 200c, Converter Clutch Willow Run - Hydra-matic M31 250c, Converter Clutch Parma MV4 350c, Converter Clutch Parma

AUTOMATIC 4-SPEED

MW9 200-4R, Converter Clutch and Overdrive 3 Rivers - Hydra-matic ME9 440-T4, Converter Clutch and Overdrive, Warren - Hydramatic Transverse MD8 700-R4, Converter Clutch and Overdrive Toledo - Hydramatic

TRUCK TRANSMISSION PRODUCTION CODE EXPLANATION

Muncie Manual Transmission Production Code Explanation

The production code number contains the source code, model year and build date.

EXAMPLE:

N 4 D 10 - - - -- SOURCE CODE MODEL YEAR BUILD MONTH DAY CODE ----------- ---------- ----------- --------

S - 3 Speed 1984 A - Jan. 10th (Saginaw Type) B - Feb. C - March N - 4 Speed D - April (117mm) E - May H - June K - July M - Aug. P - Sept. R - Oct. S - Nov. T - Dec. 3 Speed (Saginaw Type) ----------------------- The code is stamped on the left side of the case just below the side cover.

Muncie Truck 4 Speed

Stamped on the rear face of the transmission case just below the rear retainer.

New Process 205, 207 and 208 Model 4-Wheel Drive Transfer Case

The build date showing the month, day and year along with the Chevrolet part number is on a metal tag attached to the front face of the transfer case at PTO cover.

Warner Gear Four and Five Speed Manual Transmissions

The manual transmission code, part number and serial number, appears on a metal tag attached to an extension housing bolt on the left side (8 o'clock position).

EXAMPLE TAG:

Customer P/N 14078525 WA2041 Source Code

Source P/N 13-52-062 21975 Sequential Serial Number

EXAMPLE W A 20 4 1 - - -- - - SHIFT SOURCE CODE MONTH DAY YEAR CODE ------------ ------ --- ---- ---- W = Warner A-Jan. G-July 20=20th 4 = Shift B-Feb. H-Aug. Day 1984 Produced C-Mar. J-Sept. D-Apr. K-Oct. E-May L-Nov. F-June M-Dec.

Truck Four-Speed Isuzu Transmission (77.5mm)

Right side of bell housing at 3:00 o'clock position five digit ink stamp transmission serial number. Below serial number is five digit date stamp.

4 04 01 Last Digit of Year Month Date

350C and 700-R4 Turbo Hydra-Matic Transmissions

Refer to the passenger section of this bulletin for production code explanations.

400-475 Model Turbo Hydra-Matic Transmission

The transmission model number and sequence number is stamped on the identification plate located at the right rear extension.

MODEL AND SEQUENCE NUMBER EXAMPLE:

4 CM 5223

MODEL YEAR VEHICLE APPLICATION CODE SEQUENCE NUMBER

TRUCK TRANSMISSION IDENTIFICATION NUMBER FOR "SERVICE" USAGE

The following system will be used to identify service transmission assemblies domestically produced. This number system applies to complete service transmission assemblies only. Transmission cases are no longer identified. Manufacturing plants will number each service assembly as it is produced. The first letter will designate the GM division which produced the unit - "C" (Chevrolet).

The second letter will indicate the type of unit - "T" (transmission). The number following the letter will designate the model year - "4" (1984). The last five digits specify the service replacement sequence number. The group of numbers to be used by Chevrolet Manufacturing plants are as follows:

PLANT SERIAL SEQUENCE ----- --------------- Chevrolet - Parma Transmission Plant 00001 to 14999 Chevrolet - Muncie Transmission Plant 25000 to 99999 Hydra-Matic 00001 to 99999

Hydra-Matic transmissions will be numbered with the letter "H" regardless of the GM division using the transmission.

EXAMPLE: Number CT400175 designates Chevrolet transmission, year and 175th unit produced for service at Parma.

Upon completion of the serial sequence, the plant will re-use the above numbers using a letter prefix, such as A, B or C to indicate late production transmission; for example: CT2A0001.

1984 TRUCK TRANSMISSION PROGRAM SUMMARY

PROCESSING NUMBER ------ MANUAL 3-SPEED

M62 2.85 =1 First Gear Ratio Muncie M64 3.50 =1 First Gear Ratio Muncie

MANUAL 4-SPEED

MY6 3.09:1 First Gear Ratio, Overdrive New Process M20 6.55:1 First Gear Ratio Muncie M73 4.09:1 First Gear Ratio Isuzu M77 4.07:1 First Gear Ratio Borg Warner

MANUAL 5-SPEED

MB1 4.03:1 First Gear Ratio, Overdrive Borg Warner MB6 4.03:1 First Gear Ratio, Overdrive Borg Warner

AUTOMATIC 3-SPEED

MV9 200C Converter Clutch Willow Run - Hydra-matic MV4 350C, Converter Clutch Parma M40 400 Willow Run - Hydra-matic M40 475 Willow Run - Hydra-matic

AUTOMATIC 4-SPEED

MD8 700-R4, Converter Clutch, Overdrive Toledo - Hydra-matic

PASSENGER CAR REAR AXLE IDENTIFICATION

Axles are manufactured by Chevrolet Buffalo, Chevrolet Gear and Axle, Oldsmobile, Pontiac and GM of Canada (McKinnon). Divisional Manufacturer code letters will be metal stamped on the axle tube adjacent to the carrier for field identification (see example). Letters and numerals 1/4" high are metal stamped on right front inboard side, 3" outboard of carrier or are located on a metal tag attached to cover bolt.

FIELD IDENTIFICATION

6JH C 218 1 --- - --- - Manufacturer Day of 1 - For Day Shift Axle Code Identity Year Built 2 - For Night Shift

MANUFACTURER IDENTITY

O - Oldsmobile P - Pontiac G - Chevrolet Gear and Axle C - Chevrolet Buffalo K - GM of Canada, St. Catherines (McKinnon)

1984 AXLE IDENTIFICATION CODES "F" SERIES (*INDICATES POSITRACTION) -----------------------

3.08 RATIO 3.23 RATIO 3.42 RATIO 3.73 RATIO ---------- ---------- ---------- ---------- RING RING RING RING CODE GEAR CODE GEAR CODE GEAR CODE GEAR ---- ---- ---- ---- ---- ---- ----- ---- 6ET 7.5 6JH 7.5 6JJ 7.5 6JK 7.5 6EU 7.5 *6JZ 7.5 6PJ 7.5 *6JQ 7.5 6ES 7.5 *6PZ 7.5 6PK 7.5 6EW 7.5 *6PQ 7.5 6EX 7.5 6KK 7.5 6EV 7.5 6EB 7.5 6EQ 7.5 6EC 7.5 6ER 7.5 6JM 7.5 6KM 7.5 6PM 7.5

1984 AXLE IDENTIFICATION CODES "T" SERIES (*INDICATES POSITRACTION) -------------------------

3.36 RATIO 3.62 RATIO ------------ -----------

RING RING CODE GEAR CODE GEAR ---- ----- ---- ----

4TA 6.50 4TB 6.50 4TC 6.50 4TD 6.50

1984 AXLE IDENTIFICATION CODES "G" SERIES (*INDICATES POSITRACTION) --------------------------

2.29 RATIO 2.41 RATIO ------------ ------------

RING RING CODE GEAR CODE GEAR ---- ---- ---- ----

2AH 7.50 2AJ 7.50 *2BH 7.50 *2BJ 7.50 6AT 7.50 6AZ 7.50 *6BT 7.50 *6BZ 7.50

2.73 RATIO 3.08 RATIO 3.42 RATIO 3.73 RATIO ------------- ------------- ------------ ------------ RING RING RING RING CODE GEAR CODE GEAR CODE GEAR CODE GEAR ---- ----- ---- ---- ----- ----- ---- ----- 2AB 7.50 2AC 7.50 6AS 7.50 6TF 8.50 *2BB 7.50 *2BC 7.50 *6BS 7.50 *6TR 8.50 6AX 7.50 6AV 7.50 6TE 8.50 *6BX 7.50 *6BV 7.50 *6TP 8.50 6TJ 7.50

1984 AXLE IDENTIFICATION CODES "B" SERIES (*INDICATES POSITRACTION) -------------------------

2.41 RATIO 2.56 RATIO 2.73 RATIO 2.93 RATIO ------------ ------------- ----------- ------------ RING RING RING RING CODE GEAR CODE GEAR CODE GEAR CODE GEAR ----- ---- ---- ---- ---- ---- ---- ----- 8GF 7.50 4YF 8.50 8FC 7.50 8GG 7.50 8FA 7.50 *4YT 8.50 8GB 7.50 *4ZR 8.50 *4ZN 8.50 *4ZQ 8.50 *4DW 8.50 4ZF 8.50 4ZD 8.50 4YC 8.50 *4DU 8.50 *4ZU 8.50 *4YQ 8.50 *4DV 8.50 4YK 8.50 4YB 8.50 *4YX 8.50 *4YP 8.50 4YG 8.50 *4YU 8.50

3.08 RATIO 3.23 RATIO 3.73 RATIO ------------ ------------ ------------ RING RING RING CODE GEAR CODE GEAR CODE GEAR ---- ---- ---- ----- ---- -----

4ZA 8.50 4ZB 8.50 6ZN 8.50 *4ZS 8.50 *4ZT 8.50 *6ZK 8.50 4ZE 8.50 4DH 8.50 6ZJ 8.50 *4ZV 8.50 *4DY 8.50 *6ZL 8.50 4DG 8.50 4YE 8.50 *4DX 8.50 *4yS 8.50 4YD 8.50 4YM 8.50 *4YR 8.50 *4YZ 8.50 4YL 8.50 *4YY 8.50

LIGHT DUTY TRUCK REAR AXLE IDENTIFICATION

Chevrolet Light Duty Trucks use either Chevrolet, Dana or Rockwell produced rear axle assemblies. See examples of production codes below.

CHEVROLET AXLE

EXAMPLE:

-------

TUF G 001 1 --- - --- -

Axle Code Source Code Day Code Shift Code --------- ----------- -------- ----------- C = Buffalo Jan. 1 = 001 1st Shift G = Gear & Axle K = GM of Canada

Code is stamped on top of right axle tube outboard of carrier.

DANA AXLE

EXAMPLE:

---------- 603560-1 9 29 4 B 4 -------- - -- - - -

DANA MONTH DAY MODEL SHIFT PRODUCTION P/N CODE CODE YEAR CODE LINE CODE

Code is stamped on rear surface of right axle tube.

The Chevrolet produced axles use a prefix code stamped into the axle tube for axle code identification. Dana produced axles use the same prefix code as the Chevrolet axles, but they display these codes on a strip of tape attached to the outboard end of the axle tube.

1984 "C" 10-30 REAR AXLE IDENTIFICATION

STD.AXLE L/D AXLE AXLE GEAR MODEL CODE CODE RATIO BRAKE SIZE DIA. RATING AXLE MFR. ----- ---- ---- ----- ---------- ---- ------- --------- C100 BN3 2.56 11 x 2 8.5 3750 DETROIT G & A BR3 CC3 2.73 BS3 CD3 3.08 BT3 CF3 3.42 BU3 BFH 3.73

BW3 2.56 11.15 x 2.75 BX3 CJ3 2.73 BY3 AZ3 3.08 BZ3 BA3 3.42 CA3 BFJ 3.73

C100 CK3 CS3 2.73 11 x 2 V8 + CM3 CT3 3.08 M20 BJK BFM 3.73

CN3 CU3 2.73 11.15 x 2.75 CR3 CW3 3.08 BFN BFR 3.73

C20903 BDB 3.23 11.15 x 2.75 9.5 5700 BBJ BBF 3.42 BCY BFC 3.73 BCZ BJA 4.10

C20903 BDC #3.23 13 x 2.50 6000 20906 BBK BBH 3.42 (EXC BFA BDA 3.73 LE8) BJC BJB 4.10 BKC BKD 4.56

(W/LE8) BAA 3.21 10.5 BCA BCB 3.73 BHA BHB 4.10

C20943 BAB 3.21 7500 BCC BCD 3.73 BMC BHD 4.10 BKA BKB 4.56

C30903 BAC 3.21 13 X 3.50 30943 BCF BCH 3.73 31003 BHF BHK 4.10 31403 BKM BKN 4.56

C31003 BAD *3.21 DETROIT G & A 31403 BCS BCJ 3.73 DUAL WHEEL 30943 BHM BHJ 4.10 BKR BKS 4.56

C30903 BFT 3.73 DANA 30943 BJK 4.10 DUAL WHEEL BKK 4.56

# 3.23 RATIO NOT AVAILABLE ON C20906 * 3.21 RATIO NOT AVAILABLE ON C30943

1984 "K" 10-30 Rear Axle Identification

STD.AXLE L/D AXLE AXLE GEAR AXLE MODEL CODE CODE RATIO BRAKE SIZE DIA. RATING AXLE MFR. ----- ---- ---- ----- ---------- ---- ------ --------- K100 BB3 BH3 2.73 11.15 x 2.75 8.5 3750# DETROIT G & A BC3 BJ3 3.08 EX 06 BD3 BK3 3.42 4000# BF3 BM3 3.73

K100 BRA BRB 2.73 V8 + BSA BSB 3.08 M20 CX3 CZ3 3.42 CY3 DA3 3.73 K20903 BDD 3.23 9.5 5700 BBC BBA 3.42 BCW BFD 3.73 GDL GDK 4.10

BDF 3.23 13 x 2.50 6000

K20903 BBD BBM 3.42 20906 BCX BFF 3.73 BHK BJD 4.10 K30903 BCK BCM 3.73 13 x 3.50 10.5 7500 30943 BHR BHS 4.10 31003 BKU BKW 4.56 K30943 BCN BCR 3.73 DETROIT G&A 31003 BHT BHU 4.10 DUAL WHEEL 314003 BKX BKY 4.56 K30903 BFT 3.73 DANA 30943 BJK 4.10 DUAL WHEEL BKK 4.56

1984 "G" 10-30 REAR AXLE IDENTIFICATION

STD. AXLE L/D AXLE AXLE GEAR MODEL CODE CODE RATIO BRAKE SIZE DIA. RATING AXLE MFR.

G100 BRC BRF 2.73 11 x 2 8.5 3500# DETROIT G & A BSC BSF 3.08 BBN BBS 3.42 BFU BFX 3.73

G100 BRD BRH 2.73 11. 15 x 2.75 G200 BSD BSH 3.08 BBR BBT 3.42 BFW BFY 3.73

G31305-6 HHB HBC 3.73 13 x 2.50 9.5 5700 31303-32 HBD HBF 4.10

G31303-6 HBG HBH 3.23 31332

G31303 HBJ HBK 4.56 31332 BJF - 4.10 13 x 3.50 9.75 6200 DANA BKF - 4.56

G31603 BJH - 4.10 31632 BKH - 4.56

G31303 BJJ - 4.10 10.5 7500 31603 BKJ - 4.56 31632

1984 "P" 20-30 GEAR AXLE IDENTIFICATION

STD AXLE L/D AXLE AXLE GEAR MODEL CODE CODE RATIO BRAKE SIZE DIA. RATING AXLE MFR. ----- ---- ---- ----- ---------- ---- ------- --------- P20842 BYC BFC 3.73 11.15 x 2.75 9.5 5700 DETROIT G & A 21042 BCZ 4.10

BFA BDA 3.73 13 x 2.50 6000 BJC 4.10

P30842 HBL HBM 3.73 10.5 7900

31042 BHW 4.10

31442 BKZ BMA 4.56

HBN HBP 3.73 13 x 3.50 BHX 4.10 BMB BMC 4.56

P30842 BHY 4.10 DETROIT G & A 31042 BMD BMF 4.56 DUAL WHEEL 31442 BNA 5.13* 31842 30832 31132 31432 31832

P30842 TSA 5.29 13.75 x 1.53 12.0 11000 ROCKWELL 31042 DISC DUALWHEEL 31442

P31432 BKN 4.56 10.5 10000 DANA 31832 BKI 4.88 DUALWHEEL CNR 5.13

*5.13 RATIO AXLE NOT AVAILABLE ON MOTOR HOME CHASSIS 032 MODELS.

1984 S-T 10 REAR AXLE IDENTIFICATION

STD.AXLE L/D AXLE AXLE GEAR MODEL CODE CODE RATIO BRAKE SIZE DIA. RATING AXLE MFR. ----- ---- ---- ------ ---------- ---- ------ --------- S100 BRJ BRK 2.73 9.5 x 2 7.5 2600 BUFFALO G & A BSK BSM 3.08 BBU BBW 3.42 BUA BUB 3.73 BTA BTB 4.11 BRR* 2.73

T100 BRM BRW 2.73 2700 BSN BSR 3.08 BBX BBY 3.42 BUC BUD 3.73 BTC BTD 4.11

*ALUMINUM DRUMS, WITH RPO Z07 ONLY.

LIGHT DUTY TRUCK FOUR WHEEL DRIVE FRONT AXLE IDENTIFICATION

Chevrolet Light Duty Trucks use either Chevrolet or Dana produced front axle assemblies. Production code explanations are similar to those covered under rear axle identification.

CHEVROLET AXLES

Code is stamped on top rear section of left axle tube. (Includes axle ratio code.)

DANA AXLES

Code is stamped on forward side of left axle tube. Axle ratio code on tape strip around right axle tube.

1984 "K" 10-30 FRONT AXLE IDENTIFICATION

AXLE CODE MANUAL AUTO. HUB HUB AXLE BRAKE GEAR AXLE MODEL LOCKS LOCKS RATIO SYSTEM DIA. RATING AXLE MFR. ----- ----- ----- ----- ------ --- ------ ---------

K100 HAN HAA 2.73 JB/D5 8.5 3600 DETROIT G & A HAP HAB 3.08 HAR HAC 3.42

HAS HAD 3.73

K200 HAT HAF 3.23 JB/D6 3800 HAU HAG 3.42 HAW HAH 3.73

K200 HD MKB TFA 3.23 JB/D7 MHC TFB 3.42 MBC TBF 3.73 MCD TFD 4.10

K300 TBA* 3.73 JB/DB 9.75 4500 DANA SINGLE TCA* 4.10 WHEEL TDA* 4.56

K300 TBB* 3.73 DUAL TCB* 4.10 WHEEL TDB* 4.56

*K300 ASSEMBLIES DO NOT INCLUDE HUB LOCKS.

1984 "T" 10 FRONT AXLE IDENTIFICATION

MODEL AXLE CODE AXLE RATIO GEAR DIA. AXLE MFG. ----- --------- ---------- --------- ------------ T10 GRK 2.73 7.25 DETROIT G & A GRL 3.08 GRM 3.42 GRN 3.73 GRP 4.11

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.