Electra Park Avenue V6-231 3.8L VIN 3 FI (1988)
Band: All Technical Service Bulletins
A/T - New 1-2 Band Assembly Does Not Require Stop
Bulletin:
90-7440-8
Date:
Apr. '90
Ref. No. 90-113-7440
Corp. Ref. No.: 077110
SUBJECT:
NEW 1-2 BAND ASSEMBLY DOES NOT REQUIRE 1-2 BAND STOP
MODELS AFFECTED: ALL 1984-90 MODELS EQUIPPED WITH HYDRA-MATIC 4T60 (THM 440T4) TRANSAXLES
Figure 1 - Previous And New 1-2 Band Assembly
BULLETIN COVERS: (Figure 1)
A new style 1-2 band assembly is currently used in production in all Hydra-Matic 4T60 (THM 440T4) transaxles. The area on the new 1-2 band
assembly where the 1-2 band apply pin engages is almost twice as wide as the previous style. This increased area makes for a larger "target" for the 1-2
band apply pin and eliminates the need for the 1-2 band stop.
The 1-2 band stop was used to keep the 1-2 band assembly from shifting from its location, causing the 1-2 band apply pin to miss the band when
applying, creating a loss of drive.
SERVICE PROCEDURE:
The new style 1-2 band assembly can be used to service past model cases, but the 1-2 band stop must be removed.
IMPORTANT:
Use of the new 1-2 band assembly without removing and discarding the 1-2 band stop could cause premature transaxle failure.
DATE OF PRODUCTION CHANGE:
Use of the new 1-2 band assembly in production began January 16, 1990 (Julian Date 016).
SERVICE PARTS INFORMATION:
Part Number
Description
Model Year/Model Usage
8668984
Pkg. 1-2 Band Assembly
1984-90
All
-
1-2 Band Assembly
