A/T - Material Change for Clutch Apply Plates
90chevy11Number: 90-189-7A
Section: 7A
Date: March 1990
Corporate Bulletin No.:077109
Subject: CLUTCH APPLY PLATES - MATERIAL CHANGE TO POWDERED METAL IN FORWARD AND 3-4 CLUTCHES
Model and Year: 1990 ALL CARS, TRUCKS, VANS WITH 4L60 (700-R4) AUTOMATIC TRANSMISSION
Figure 1:
This bulletin covers a material change for the forward and 3-4 clutch apply plates. These clutches will now contain apply plates manufactured from powdered metal instead of steel.
The following dates show when changes went into effect: (Figure 1)
Apply Plate Start of Production Date
Forward January 25, 1990 (Julian Date 025)
3-4 January 29, 1990 (Julian Date 029)
The new powdered metal plates are interchangeable with the current steel plates. Dimensions of the new powdered metal plates are the same as the steel plates. Powdered metal plates will appear darker in color than previously produced steel plates.
Figure 2:
Part numbers have changed. (Figure 2)
Part Number Description
8663785 Apply Plate - Forward Clutch (steel)
8667423 Apply Plate - 3-4 Clutch (steel)
* 8676059 Apply Plate - Forward Clutch (powdered metal)
8676379 Apply Plate - 3-4 Clutch (powdered metal)
When GMSPO stock of steel plates is used up, powdered metal plates will be available for service.
Parts are currently available from GMSPO.