Seville V8-273 4.5L (1989)
Valve Body: All Technical Service Bulletins
A/T - Overhaul Packages Availability
Bulletin No.
T-90-63
File in Group
7
Number
217
Corp. Ref. No.
977153
Date
April, 1990
SUBJECT:
TRANSAXLE OVERHAUL PACKAGES - 4T60
MODELS AFFECTED:
1989-1990 DE VILLES, FLEETWOODS, ELDORADOS, AND SEVILLES
1989-1990 model HYDRA-MATIC 4T60 transaxles produced after March 17, 1989 (Julian Date 076) were recalibrated to match new 3rd clutch fiber
material. The recalibrations required changes to the spacer plate, 3-2 control spring, and 2-3 accumulator spring. Transaxle model codes were changed at
the time to allow referencing of internal components for service.
Model Code Changes:
Old
New
AA
AC
AB
AD
AF
AH
Service Parts Information:
When replacing the 3rd clutch fiber plates on 1989 or 1990 models for any reason, order service parts according to the model code on the identification
tag.
IF THESE PACKAGES ARE NOT AVAILABLE, ORDER 8662990 FOR 3RD CLUTCH PLATES OR 8662989 FOR OVERHAUL PACKAGES
AND A CALIBRATION UPDATE KIT, 8675936. THE UPDATE KIT CONTAINS THE 2-3 ACCUMULATOR VALVE SPRING, 3-2 CONTROL
VALVE SPRING, AND SPACER PLATE ASSEMBLY. ALL COMPONENTS IN THE CALIBRATION UPDATE KIT MUST BE INSTALLED IN
THE VALVE BODY TO COMPLETE THE UPDATE. AFTER THE CALIBRATION UPDATE IS COMPLETED, INSTALL THE APPROPRIATE
NEW MODEL TAG SUPPLIED WITH THE KIT.
