Beretta V6-173 2.8L (1989)
Clutch: All Technical Service Bulletins
A/T - New Clutch Plates
Number:
91-84-7A
Section:
7A
Date:
October 1990
Corp. Bulletin No.: 077136
Subject:
NEW PLATES - 4TH CLUTCH REACTION, FORWARD CLUTCH, LOW AND REVERSE WAVED
Model and Year:
1982-90 CELEBRITY, 1982-91 CAVALIER, 1987-91 CORSICA/BERETTA, 1990-91 LUMINA, 1990-91 U VAN (APV) WITH
THM F-7, 3T40, 4T60, AND 4T60-E AUTOMATIC TRANSMISSION
Figure 1 - New 4th Clutch Plate Assembly
TO:
ALL CHEVROLET DEALERS
BULLETIN COVERS: (Figure 1)
New 4th clutch reaction plates for the HYDRA-MATIC 4T60, 4T60-E and THM F-7 transaxles; and new forward clutch and lo and reverse waved plates
for the HYDRAMATIC 3T40. All three new plates will have blackened edges, and the flat surfaces will have some lightly blackened areas. The new
plates are made with a new process to aid manufacturing. A by-product of this new process is that the edges will be blackened, and the flat surfaces will
have some lightly blackened areas. Figure 1 shows an example of a 4th clutch reaction plate with blackened areas and edges. The forward clutch and lo
and reverse clutch waved plates will have similar markings.
SERVICE PROCEDURE:
Replace the 4th clutch reaction plates if severely warped. Replace the 4th clutch reaction plates, forward clutch waved plate, or the lo and reverse waved
plates if they have obvious large overheated, discolored areas that mate to the fiber material plate. Heat discoloration on the plate back side (non-fiber
mating surfaces) should be considered normal, unless the plate is warped.
DATE OF PRODUCTION CHANGE:
Beginning July 25, 1990 (Julian Date 206), some 1991 HYDRA-MATIC 4T60, HYDRAMATIC 4T60-E and THM F-7 transaxles were built with the
new 4th clutch reaction plates. As of September 10, 1990 (Julian Date 253) all models should have the new reaction plates. Future production changes
that will include the new forward clutch and lo and reverse waved plates are scheduled for all 1991 HYDRA-MATIC 3T40 transaxies beginning October
10, 1990 (Julian Date 283).
SERVICE PARTS INFORMATION:
The new parts will be available when the previous parts are depleted.
SERVICE MANUAL REFERENCE:
Refer to the appropriate Service Manual for proper disassembly and assembly procedures.
