C 3500 Truck 2WD V8-379 6.2L DSL (1988)
Clutch Disc: Customer Interest
M/T Clutch - Chatter or Shudder
Number:
90-336-7C
Section:
7C
Date:
August 1990
Corp. Bulletin No.: 067302
Subject:
CLUTCH CHATTER/SHUDDER ON LAUNCH
Model and Year:
1988-90 C/K WITH 5.7L (VIN CODE K) AND 6.2L (VIN CODE C, J) DIESEL ENGINE WITH 4 OR 5 SPEED MANUAL
TRANSMISSION
TO:
ALL CHEVROLET DEALERS
Some 1988 - 90 C/K trucks equipped with 5.7L and 6.2L engines with 4 speed and 5 speed manual transmissions may experience a condition of chatter
or shudder on launch. Revised clutch discs and matching pressure plates have been released for these vehicles and are available through GMSPO. The
installation of these parts will provide significant improvement in the involved vehicles.
DATE OF PRODUCTION CHANGE
Revised pressure plates were installed shortly after the start of the 1990 model year. Revised clutch discs will be installed at the start of the 1991 model
year.
SERVICE PROCEDURE:
1988 OR 1989 MODEL: The pressure plate and clutch disc should be replaced at the same time as the parts have been designed to work together.
1990 MODEL:
These vehicles should require a new clutch disc only. However, when the pressure plate is removed inspect the cover for a manufacturer's name stamp. If
the name Valeo appears on the pressure plate cover, the pressure plate is of the revised design and does not need replacement unless damaged. If the
name Borg and Beck appears on the pressure plate cover, the pressure plate assembly requires replacement. Only very early production 1990 vehicles
may be equipped with Borg & Beck pressure plates.
Refer to section 7C of the appropriate service manual for clutch disc and pressure plate replacement procedure.
SERVICE PARTS INFORMATION
PRESSURE
CLUTCH
ENGINE
TRANSMISSION
PLATE P/N
DISC P/N
5.7L
5 SPEED
15638388
15668525
5.7L
4 SPEED
15638388
15668526
6.2L
4 SPEED
15638388
15668525
Parts are currently available through GMSPO.
WARRANTY INFORMATION
For vehicles repaired under warranty use:
Labor Operation:
K0800
Labor Time:
Use appropriate labor time in the labor time guide.
