K 30 1 Ton Pickup 4WD V8-379 6.2L DSL VIN J FI (1982)
Valve Body: All Technical Service Bulletins
A/T - Torsional Rattle With TCC Engaged
Number:
83-T-5
Section:
VIIc
Date:
Nov., 1983
Subject:
TORSIONAL RATTLE - 1982-83
"K" TRUCKS WITH 6.2L DIESEL ENGINE AND THM 700-R4 TRANSMISSION
TO:
ALL CHEVROLET DEALERS
Some 1982 and early production 1983 "K" trucks equipped with 6.2L diesel engines and 700-R4 transmissions may experience a noticeable torsional
rattle when the converter clutch engages in second, third or fourth gear, under light to moderate throttle at speeds below 40 mph. This rattle condition
which is torque converter clutch/drive train related, can be improved by increasing the TCC engagement speed to 40 mph.
FIGURE 1
This can be accomplished by replacing the converter clutch throttle valve, sleeve and spring in the valve body with P/N 8642970 (Figure 1). This service
package will consist of the following:
^
Valve - Converter Clutch Throttle
^
Sleeve - Converter Clutch Throttle
^
Spring - Converter Clutch Throttle
^
Instruction Sheet
If an objectionable rattle still exists after installing the service package, additional noise dampening can be achieved by filling the propshaft with
urethane foam per the following recommended procedure:
1.
Obtain a urethane foam dispensing system, Insta-Foam Product's Model #9.5 Froth Pak Kit or equivalent, which is a small volume kit complete
with all the required chemicals, dispensing equipment and instructions. A maximum of one
(1)
Froth Pak Kit will be required to foam-fill a propshaft from a long wheel base vehicle such as a Suburban or Pick-up.
2.
Remove propshaft from vehicle.
