A/T - New Low and Reverse Clutch Wave Plate

91pontiac04

Bulletin Number: 91-7-26A
Reference Number: 077148
Publish Date: 2/91


Subject:
LOW AND REVERSE CLUTCH (NEW WAVED PLATE)

Models Affected:
1987-91 FIREBIRD AND SAFARI MODELS WITH 4L60 (700R4)


This bulletin is being revised to correct the part number listed below. This bulletin cancels and replaces bulletin 91-7-26, dated 02/91.

Figure 2 - Lo And Reverse Clutch Waved Plate:

SERVICE INFORMATION: (Figure 2)

Low and Reverse Clutch failure can be caused by case casting flash interfering with clutch plate travel. A new wave plate is now available which will alleviate this condition. This new plate can be used to service any Hydra-matic 4L60 transmission produced after February 9, 1987 (Julian Date 040).

When installing the new wave plate, check for any case flash that may be present in the low and reverse grooves, and use a metal file to remove. See Figure 2 for case location information.

SERVICE PARTS INFORMATION:

Description New Part #

Plate - Low and Reverse (Wave) 8676362

Part is currently available from GMSPO.

Figure 1 - HYDRA-MATIC 4L60 Transmission Identification Information:

DATE OF PRODUCTION CHANGE: (Figure 1)

Beginning March 28, 1990 (Julian Date 087), all HYDRA-MATIC 4L60 transmissions were built using the new low and reverse clutch wave plate.

SERVICE MANUAL REFERENCE:

Refer to the Automatic Transmission Unit Repair Section of the appropriate service manual for low and reverse clutch plate removal and installation information.