A/T - Revised Style 1-2 Band Assembly
90oldsmobile05SUBJECT 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:
Part Number Description Model Year/Model Usage
8668984 Pkg. 1-2 Band Assembly 1984-90 All
- 1-2 Band Assembly
- Instruction Sheet
Parts are currently available from GMSPO.