PROM - New Calibration Reduces Chuggle
NUMBER: 92-T-176CORP.REF.NO: 376507
DATE: July 1993
SECTION: 6E2, V6 7A, 4L60
SUBJECT:
CHUGGLE - NEW CALIBRATION PROM
MODELS/YEARS:
1992 CUSTOM CRUISER W/5.7L (VIN 7) ENGINE AND 2.73 AXLE (RPO GU2)
CONDITION:
Some owners with vehicles listed below, equipped with 5.7L V8 engines, may comment about a "chuggle" condition.
This bulletin addresses the following vehicle/condition ONLY:
Vehicle Condition
Custom Cruiser Chuggle with base axle only
RPO GU2, 2.73 ratio
CAUSE:
Insufficient dampening of the torque converter and PROM calibration.
CORRECTION:
New calibration PROMs have been released to address the above vehicle/condition.
The PROM is NOT RECOMMENDED for vehicles with OPTIONAL 3.23 AXLE RATIOS or TRAILER TOWING PACKAGES.
Note:
The above vehicles produced before December 16, 1991 (Julian Date 350) may have HydraMatic 4L60 Model 2DDM Transmissions. Model 2DDM transmissions may contain torque converters with insufficient dampening.
Vehicles with Model 2DDM transmission - Check dealer records to see if the torque converter has already been replaced with P/N 8650935 (tagged Broadcast Code: DGAF). It is not necessary to replace those torque converters with P/N 8650935.
Transmissions with torque converters with P/N 8656959 (tagged B/C: DG5F) need to have the torque converter replaced with P/N 8650935.
Model 2BRM transmissions P/N 8650935 (produced after December 16, 1991) have the new torque converter.
Parts are currently available from GMSPO.
WARRANTY INFORMATION:
Labor Operation
Replace PROM T0500 0.6 hour
Replace Torque Converter K7020 2.8 hours