A/T - Modifications to Overhaul Packages

89cadillac11

Bulletin No. T-89-136
File in Group 7
Number 208
Corp.Ref.No. 977123
Date Aug. 1989
SUBJECT: SERVICE INFORMATION FOR TRANSMISSION OVERHAUL PACKAGES - 1989-1990 THM 440-T4/HYDRA-MATIC 4T60

MODELS AFFECTED: 1989-1990 DE VILLES, FLEETWOODS, ELDORADOS, AND SEVILLES


Due to changes in 3rd clutch fiber material for production and service parts, transaxles produced after Julian Date 076 (March 17, 1989) must be serviced with a revised overhaul package and 3rd clutch plate assembly. Transaxles built after that date contain a new spacer plate, 3-2 control spring, 2-3 accumulator spring, and revised 3rd clutch material. Model code designations were also changed to allow easy identification.

MODEL CODE CHANGES

Old Model New Model

AAH ACH
ABH ADH
AFH AHH

Figure 1 - HYDRA-MATIC 4T60 Transaxle Identification Information:

Service Parts:

When replacing the 3rd clutch fiber plates on 1989 or 1990 models for any reason, check the two-letter model code on the identification tag. Refer to Figure 1. Order overhaul packages, 3rd clutch plate assembly packages, and valve body assemblies according to the model code. The reference chart below lists proper service parts for recalibrated models built after March 17, 1989.

Valve Body Spacer Plate 3rd Clutch Overhaul
Model Code I.D. Last 4 Numbers Plate Assembly Package

AC, AD, AH 9A-3 5213 8662990 8662989
Harsh or slip-bump 2-3 and 3-2 shifts will occur if parts are mixed.

Figure 2 - Marking For New 3rd Clutch Plate Assembly:

IMPORTANT: The revised 3rd clutch plates may have markings as shown in Figure 2 - four black stripes about 1/8" wide with no notch in one of the teeth.