TORQUE CONVERTER CLUTCH GROWL NOISE-INSTALL NEW MEMCAL PROM
SUBJECT: TORQUE CONVERTER CLUTCH GROWL NOISE (INSTALL NEW MEM-CAL PROM)
MODELS: 1991-92 "G" VAN WITH 4L80-E/4L80-EHD TRANSMISSION
CONDITION
Some 1992 HYDRA-MATIC 4L80-E/4L80-EHD transmissions may experience a Torque Converter Clutch growl noise.
CAUSE
This is caused by too low of a vehicle speed for Torque Converter Clutch release.
CORRECTION
A new Mem-Cal Prom was released that raises the Torque Converter Clutch release point.
Date of Production: (Figure 1) ------------------------------ Starting April 1, 1992 (Julian Date 091) all 1992 MKP HYDRA-MATIC 4L80-E/4L80-EHD models were built with the new Mem-Cal and TCM.
SERVICE PARTS INFORMATION
Previous Previous New New Broadcast Mem-Cal Broadcast Mem-Cal Code (E-Prom) Code (E-Prom) -------- -------- --------- -------- ATUA 16160302 BBKK 16179337
Parts are currently available. In case of limited inventory, parts will be placed on 400 control to waive VIP surcharges. Only verifiable emergency VIP orders will be accepted. GMSPO will make every effort to obtain parts. However, the part will be shipped premium transportation at dealer's expense and all other order types will be placed on backorder until the 400 control is removed.
WARRANTY INFORMATION
For vehicles repaired under warranty use: Labor Operation: T0500 Labor Time: .5 hours
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.
