Ciera V6-173 2.8L VIN W FI (1986)
Band: All Technical Service Bulletins
A/T - Revised Style 1-2 Band Assembly
SUBJECT
NEW 1-2 BAND ASSEMBLY - DOES NOT REQUIRE 1-2
BAND STOP
MODELS/YEARS
1984-1990 CUTLASS CIERA, 1988-1990 CUTLASS
SUPREME, 1986-1990 EIGHTY-EIGHT, 1985-1990 NINETY-EIGHT, 1986-1990 TORONADO EQUIPPED WITH
HYDRA-MATIC 4T60 (THM 440-T4) THANSAXLE (RPO-ME9)
NUMBER:
90-T-80
CORP.REF.NO: 077110
DATE:
April 1990
SECTION:
4T60
Figure 1 - Previous And New 1-2 Band Assembly
A new style 1-2 band assembly will be used in production of all HYDRA-MATIC 4T60 (THM 440-T4) 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 off location. If the band shifts off location, this would cause the 1-2 band apply
pin to mlss the band while stroking, creating a loss of drive. See Figure 1.
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:
If the new 1-2 band assembly is used with a 1-2 band stop, durability concerns may result.
DATE OF PRODUCTION CHANGE:
The new 1-2 band assembly was put in production starting January 16, 1990 (Julian Date 016).
SERVICE NOTES:
When the supply of previous style 1-2 band assemblies is depleted, the new 1-2 band assembly will be the only style available.
SERVICE PARTS INFORMATION:
