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

MODELS AFFECTED: 1984 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(1)

(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 labor Operation No. K6560 at 0.7 hour.

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.