Celebrity V6-191 3.1L (1990)
Drive Chain: Technical Service Bulletins
A/T - Driven Sprocket Support/Scavenging ScoopRevised
Number:
90-96-7A
Section:
7A
Date:
December 1989
Corporate Bulletin No.: 977157
Subject:
NEW DRIVEN SPROCKET SUPPORT AND CHAIN SCAVENGING SCOOP
Model and Year:
1990 A, CARS WITH 4T60/440-T4 AUTOMATIC TRANSMISSION
Figure 1 - Previous And New Driven Sprocket Support
Figure 2 - Cutting Previous Scoop To Fit New Support
TO:
ALL CHEVROLET DEALERS
A new driven sprocket support and chain scavenging scoop is used in production on 1990 A and W cars equipped with 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. (See Figure 1.)
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.