Lumina L4-151 2.5L (1991)
Transmission Cooler: Customer Interest
A/T - 4T60 No or Slipping 3rd Gear/No Reverse/Drive
Number:
91-87-7A
Section:
7A
Date:
October 1990
Corp. Bulletin No.: 077140
Subject:
NO 3RD GEAR, AND/OR NO DRIVE OR REVERSE
Model and Year:
1984-90 CELEBRITY AND 1990-91 LUMINA WITH 4T60, F-7 AUTOMATIC TRANSMISSION
TO:
ALL CHEVROLET DEALERS
BULLETIN COVERS:
Center gearbox distress diagnosis tips - all 1984-91 HYDRA-MATIC 4T60 and THM F-7 transaxles. Center gearbox distress in a HYDRA-MATIC
4T60 or THM F-7 transaxle may result in one of the following conditions:
1.
No 3rd gear due to a distressed 3rd roller clutch cage. Also, slips in 3rd gear or no 3rd gear.
2.
No drive or reverse due to a distressed input sprag.
3.
Distressed 3rd and input clutch fiber and reaction (steel) plates.
