Lumina L4-151 2.5L (1991)
Channel Plate: All Technical Service Bulletins
Transaxle - Bearing Whine in 1ST, 2ND, and 3RD Gear
Number: 93-272-7A
Section: 7A
Date: JULY 1993
Corporate Bulletin No.: 377130
ASE No.: A2
Subject:
TRANSAXLE BEARING WHINE AUDIBLE IN 1ST, 2ND, AND 3RD GEAR
Model and Year:
1991-93 LUMINA AND 1991-93 LUMINA APV WITH 4T60/4T60-E AUTOMATIC TRANSMISSION
Some vehicles equipped with a HYDRA-MATIC 4T60 (RPO ME9) or 4T60-E (RPO M13) transaxle built on or before June 23, 1993 (Julian Date 174),
may exhibit a transaxle bearing whine that is audible in 1st, 2nd, and 3rd gear. The whine is most audible on the "driver's" side of the vehicle while in
2nd gear during a light throttle acceleration.
IMPORTANT:
This bearing whine cannot be heard in "Park" or "Neutral."
CAUSE: (Figure 1)
The Bearing Assembly, 4th Channel Plate Hub/Channel Plate" (503/431) may have been improperly installed causing the needle bearings to leave
indentation marks on the bearing race.
CORRECTION:
Replace the "Bearing Assembly, 4th Channel Plate Hub/ Channel Plate" (503/431) located on the "Channel Plate Assembly" (404/401).
PART INFORMATION:
Part number for the "Bearing Assembly, 4th Channel Plate Hub/Channel Plate" is the same for the 4T60 and 4T60- E transaxle.
PART NUMBER: 8656393
DESCRIPTION: Bearing Assembly, 4th Channel Plate Hub/Channel Plate
Parts are currently available from GMSPO.
