Driveline - Torsional Vibration
87chevy11GMC NUMBER:
GROUP: 7B - Manual Transmission
DATE: July, 1987
CORPORATE
NUMBER: 767201
SUBJECT: DRIVELINE TORSIONAL VIBRATION
MODELS: 1984-1987 S/T TRUCKS WITH MANUAL TRANSMISSIONS
THIS BULLETIN CANCELS AND SUPERSEDES TRUCK SERVICE
BULLETIN 86-B-22 DATED DECEMBER, 1985, ALL COPIES OF WHICH
SHOULD BE DESTROYED.
Some 1984-87 S/T trucks that experience driveline torsional vibration (noticeable at low engine RPM) may be repaired by installing a revised clutch plate, which incorporates a longer dampener travel to remove vibration.
P/N 15608690 Plate Assembly 2.5L (LN8)
P/N 15608691 Plate Assembly 2.8L (LL2)
The above parts will be incorporated into production with the start of 1988 model year trucks.