HARSH 3-4 UPSHIFT CONDITION WITH HT4100 & THM 325-4L

VEHICLES AFFECTED: 1984 Cadillac Eldorados and Sevilles

Some 1984 Eldorados and Sevilles equipped with HT4100 engines and THM 325-4L transmissions built prior to serial numbers 84 AJ 84686 or 84 AE 4838 (refer to Figure 1) may exhibit a condition of harsh shift feel, or bump, during a 3-4 upshift. To fix this condition, calibration changes were made to the control valve assembly, spacer plate and associated gaskets; and a 3-4 accumulator spring was added.

To repair a harsh 3-4 upshift condition on transmissions built prior to the listed serial numbers, install the following parts:

REFER TO PART NAME IDENTIFICATION PART NUMBER FIGURE --------- -------------- ----------- ------ Control Valve Assembly 'AJ2' (ink stamp) 8639641 2

Spacer Plate 'AJ' (with V-notch) 8635661 3

Gaskets(l) (Case Side) V-notch 8639856 3 (Control Valve Side) V-notch 8639857 3

3-4 Accumulator Spring (2) Pink and Green 8639858 4

(1) Each gasket packaged separately, not available in kit form.

(2) Position spring between 3-4 accumulator piston and housing (refer to Figure 4).

For warranty purposes, use most applicable Labour Operation from the Canadian Labour Time Guide and Claim 0.7 hours.

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.