Ciera V6-231 3.8L (1986)
Drive Chain: All Technical Service Bulletins
A/T - New Chain Scavenging Scoop and Sprocket Support
SUBJECT
NEW DRIVEN SPROCKET SUPPORT AND CHAIN
SCAVENGING SCOOP
MODELS/YEARS
ALL 1984-90 MODELS EQUIPPED WITH HYDRA-MATIC
4T60 (THM 440-T4) TRANSAXLE (RPO - ME9)
NUMBER:
90-T-36
CORP.REF.NO: 977157
DATE:
January 1990
SECTION:
7A
Figure 1 - Previous And New Driven Sprocket Support
CHANGE TO ASSEMBLY COMPONENTS:(Figure 1)
A new driven sprocket support and chain scavenging scoop is used in production on 1990 Cutlass Ciera, Ninety-Eight, Eighty-Eight, Toronado and
Cutlass Supreme models equipped wfth a HYDRA-MATIC 4T60 (THM 440-T4). The new driven sprocket support requires the chain scavenging scoop
to be about 1/3 the length of the previous scoop.
IMPORTANT:
The new driven sprocket support will service past models, but the new length of the chain scavenging scoop must be used with it. The
previous scoop will not fit. Do not leave out. This will cause durability concerns.
Do not use the new length of the chain scavenging scoop with the previous driven sprocket support assembly. This will cause
durability concerns.
DATE OF PRODUCTION CHANGE:
Starting August 16, 1989 (Julian Date 228) all HYDRA-MATIC 4T60 (THM 440-T4) will be built with the new driven sprocket support and chain
scavenging scoop.