Electra Park Avenue V6-231 3.8L VIN 3 FI (1988)
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The 3rd roller clutch outer race will have four less lube holes. The four lube holes are in line with the very end of the rollers. (Figure 2)
Eliminating these holes helps keep the rollers from skewing or the edge of the rollers from dipping into the lube hole when overrunning, generating
increased heat.
IMPORTANT:
Do not try to modify the previous style parts to the new style; this may cause durability concerns.
SERVICE PROCEDURE:
Use the new output shaft/bearing and new 3rd roller clutch assembly for an obvious increased heat concern of the 3rd roller clutch or input sprag
assemblies. This would include distortion of the plastic cage for the 3rd roller clutch and/or a blue race on the input sprag.
The new parts will assemble the same way as the previous parts. The new output shaft and bearing will service previous models back to the 1988 model
year change for the longer output shaft required for the larger differential side gears and larger differential pinions gears in the final drive assembly.
Refer to Service Bulletin 88-7440-9. The new 3rd roller clutch assembly will service all 1989 and 1990 models that have been equipped with an input
housing thrust bearing assembly. Refer to Service Bulletin 89-7440-6.
DATE OF PRODUCTION CHANGE:
On December 11, 1989 (Julian Date 345) all Hydra-Matic 4T60 (THM 44OT4) transaxles began using the new 3rd roller clutch assembly.
On January 25, 1990 (Julian Date 025) all Hydra-Matic 4T60 (THM 44OT4) transaxles began using the new output shaft/bearing.
SERVICE PARTS INFORMATION:
Part No.
Description Package Contents
Model Year/Model Usage
8668990
Package, Output Shaft and
Refer to Service
Bearing
Procedure
8675032
Bearing, Input Sun Gear/
" "
Output Shaft
8677016
Roller Assembly Complete, " "
3rd Clutch
Part numbers 8668990 and 8675032 are expected to be available on 4-16-90. Part number 8677016 is expected to be available on 5-28-90. Until then,
normal part orders will not be accepted by GMSPO. Only verifiable emergency VIP orders will be accepted. SPO will make every effort to obtain parts.
All parts will be placed on 400 control to waive VIP surcharges. However, the part will be shipped premium transportation at dealer's expense. All other
order types will be canceled as incorrectly ordered while the 400 control is in place.
SERVICE MANUAL REFERENCE:
Refer to the appropriate Service Information Manual, Section 7A1 Automatic Transaxle On-Car Service and Hydra-Matic 4T60 (THM 440T4) Unit
Repair Section.
