NO REVERSE/SLIPPING IN REVERSE REPEAT REVERSE BAND DISTRESS
SUBJECT: NO REVERSE, SLIPPING IN REVERSE, AND/OR REPEAT REVERSE BAND DISTRESS - 4T60 (THM 440-T4)
MODELS AFFECTED: 1987-1990 DE VILLES, FLEETWOODS, ELDORADOS, AND SEVILLES
Some 1987-1990 DeVilles, Fleetwoods, Eldorados, and Sevilles may exhibit no reverse, slipping in reverse, and/or repeat reverse band distress. This may be caused by excess case wall thickness in the area where the reverse band apply pin engages the apply bracket. Excess thickness will create an interference between the reverse band apply bracket and the case, which can prevent full band apply or release, and lead to band fiber material distress.
Identification:
Case external and internal identification markings can be used to verify a suspect case which should be replaced.
If the transaxle exhibits any of the above conditions, inspect the Julian Date and case die number. If the Julian Date is within the ranges listed for the applicable die number, an internal inspection is needed to determine the spline number. If the spline number is the one listed for the applicable die number, the case must be replaced. The spline number is located deep inside the barrel of the case next to the right axle seal. If the case is not a suspect unit, then refer to the Automatic Transaxle Diagnosis section of the Service Information Manual for repair procedures.
Die Spline Number Julian Date (Date) to Julian Date (Date) Number ------ ---------------------------------------- ----- 527 207 (07/25/88) - 309 (11/05/89 4543 557 078 (03/19/90 - 161 (06/10/90 4542 558 029 01/29/90 - 161 06/10/90 4541 561 156 07/15/87 - 161 06/10/90 1524 590 065 03/06/89 - 049 02/18/90 4542
Transaxle P/N Description Model Year Model Usage ------- --------------- ----------- ------------------------- 8662928 Case, Transaxle 1987-1990 All with previous park system built before September 25, 1989 (Julian Date 268)*
8668985 Case, Transaxle 1990 All with new park system built after September 24, 1989 (Julian Date 267)*
* Reference Service Bulletin T-90-34 for more information on the new park lock system.
Refer to the appropriate Service Information Manual for proper procedures.
WARRANTY INFORMATION VEHICLE SERIES
Operation C D E J K V Operation Description Number ------------------------ -------- --- --- --- --- --- --- Case, Transaxle - Replace K7800 6.5 7.1 7.1
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.
