Celebrity V6-191 3.1L (1990)
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.
The new driven sprocket support and chain scavenging scoop will assemble the same way as the previous. The previous scoop can be cut to fit the new
support. Lay the previous scoop on the actual size scoop in Figure 2 and cut at the line. Smooth off the rough cut edge.
Part Number
Description
Model Year
8668385
Support Assembly, Driven Sprocket
1984-90
8668613
Scoop, Chain Scavenging
1984-90*
-
Natural color for 35 tooth driven sprocket *Must be only used with new support
8651622
Scoop, Chain Scavenging
1984-90*
-
Black color for 33 tooth driven sprocket *Must be only used with new support
Parts are currently available from GMSPO.
The service part number did not change from the previous to the new driven sprocket support assembly. Either style may be available until the previous
style stock is depleted; then the new style support will be the only style available. Cut the previous chain scavenging scoop for the new style support
following procedures listed in this Service Bulletin.
Refer to the appropriate Service Information Manual for service procedures.