A/T - Driveline Rattle at 40 MPH W/TCC Engaged
90chevy23GMC NUMBER: 90-7A-70(A)
GROUP: 7A-AUTOMATIC TRANSMISSION
DATE: AUGUST, 1990
CORPORATE
NUMBER: 967101R
SUBJECT: DRIVELINE RATTLE AT 40 MPH WITH TCC ENGAGED
MODELS: 1988-90 V1, V2, K1, K2 WITH 5.OL OR 5.7L ENGINES AND 70OR4 (4L60) AUTOMATIC TRANSMISSIONS
THIS BULLETIN CANCELS AND REPLACES GMC BULLETIN 90-4A-14 (CORPORATE NUMBER 967101). ALL COPIES OF 90-4A-14 SHOULD BE DISCARDED.
Driveline rattle at 40 MPH with TCC engaged can be eliminated in V and K model vehicles with 5.OL or 5.7L gas engines and 70OR4 automatic transmissions by installing a new torque converter, part number 8650935. The new torque converter has an increased compression converter clutch spring and will eliminate the vibration which is sometimes heard as driveline rattle.
PARTS INFORMATION:
Part Number Description
8650935 torque converter
Parts are currently available through GMSPO.
WARRANTY INFORMATION:
For vehicles repaired under warranty use:
LABOR OPERATION: T8145
LABOR TIME: K models 4.0 hrs. V models 3.4 hrs.
ADD: With skid plate 0.2 hr
NOTE: Labor Operation is coded to base vehicle coverage in the warranty system.