A/T - New 1-2 and Reverse Bands

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NUMBER: 91-T-28


CORP.REF.NO: 077125R


DATE: December 1990


SECTION: 4T60


SUBJECT NEW 1-2 AND REVERSE BANDS - NO SELECTIVE BAND APPLY PINS REQUIRED


MODELS/YEARS ALL 1984-1991 MODELS EQUIPPED WITH HYDRA MATIC 4T60 (THM 440-T4) TRANSAXLE (RPO-ME9)

Figure 1:

Figure 2:

This bulletin covers new 1-2 and reverse band assemblies that do not require selective band apply pins.(Figures 1 and 2) A new manufacturing process machines the area where the case anchor pins contact the band. With this new process, all the 1-2 bands are the same size and all the reverse bands are the same size. With the bands all the same size, selective band apply pins are not required. NOW, THERE IS NO NEED TO MEASURE FOR SELECTIVE BAND APPLY PINS FOR THE ENTIRE NORMAL SERVICE LIFE OF THE BAND.

SERVICE PROCEDURE:


Do not measure for selective band apply pins - this will be removed from the labor time allowance for all applicable 1991 labor K-codes. If replacing a 1984 through 1991 model year transaxle 1-2 or reverse band, it is not necessary to measure for selective band apply pin(s), provided that the band service package contains an instruction sheet about the non-selective band apply pin band.


IMPORTANT: If ordering a new 1-2 or reverse band, the correct band apply pin must be used with the band. The correct band apply pin is not included with the new band service package(s) (that includes an instruction sheet about the non-selective band apply pin band). The proper band apply pin must be ordered separately.


NOTICE: If replacing a 1-2 band with the new 1-2 band listed in this bulletin, the 1-2 band stop (on models so equipped) must be removed prior to installing the band. The 1-2 band stop, if not removed, would cause the new 1-2 band to remain partly applied, distressing the 1-2 band. Reference Dealer Technical Bulletin 90-T-80.


IMPORTANT: If replacing reverse band assembly, the new band also has the new friction material that will help decrease reverse engagement concerns. Reference Dealer Technical Bulletin 90- T-109.

DATE OF PRODUCTION CHANGE:

Beginning July 2, 1990 (Julian Date 183), all 1991 HYDRA-MATIC 4T60 transaxles were built with the new 1- 2 and reverse band assemblies.

SERVICE PARTS INFORMATION:

The new bands will replace the previous bands.

Part Model Model
Number Description Year Usage

8675986 Package - Reverse Band Asm. 1984-91 All
-Reverse Band Assembly
-Instruction Sheet

8656543 Pin - Reverse Band Apply 1984-91 All

8675987 Package - 1-2 Band Asm. 1984-91 All
1-2 Band Assembly
-Instruction Sheet

8656540 Pin - 1-2 Band Apply 1984-91 All


Parts are currently available from GMSPO.


SERVICE MANUAL REFERENCE:


Refer to the appropriate Service Manual for proper disassembly and assembly procedures. The 1991 Service Manual shows the procedure to measure the 1-2 and reverse band apply pins and should be disregarded.