C 3500 Truck 2WD V8-454 7.4L (1990)
Figure 3 - Clutch Plate Installation
BULLETIN COVERS:
Some HYDRA-MATIC 3L80 (THM 400) models have a new direct clutch pack which includes two different steel plates that will increase minimum
running clearance, reduce drag and prevent higher temperatures.
DATE OF PRODUCTION CHANGE: (Figure 1)
Beginning April 3, 1990 (Julian Date 093) all 1990 FAA, HCA, HFA, HHA, LXA, MTA, MWA, MXA, MZA, SBA, SHA, SJA, TAA, TBA, TDA,
TFA, TKA, TMA, TNA, TRA models will be built with this new clutch pack.
SERVICE PARTS INFORMATION:
Part
New
Previous
Number
Quantity
Quantity
Part Name
8625197
3
5
Plate-Clutch (.0915 Flat) (622)
8623849
2
0
Plate-Clutch (.0775 Flat) (622)
NOTE:
Install three 8625197 Steel Plates first, then two 8623849 on top. Alternate steel and composition plates as shown in Figure 3. All 1990
vehicles built with previous quantity can be switched to the new quantity.
Parts are currently available from GMSPO.
SERVICE MANUAL REFERENCE: (Figure 2 & 3)
Refer to the Unit Repair Section of the appropriate Service Manual for the proper replacement procedures.
