Suburban 1/2 Ton 2WD V8-350 5.7L (1986)
Clutch: All Technical Service Bulletins
A/T - Slipping/Loss of Drive Range
Number:
86-220
Section:
7A
Date:
FEB.., 1987
Subject:
SLIPPING/LOSS OF DRIVE RANGE THM 700-R4
Model and Year:1982-86 PASSENGER CARS
AND TRUCKS WITH THM 700-R4 TRANSMISSIONS
TO:
ALL CHEVROLET DEALERS
This bulletin cancels and supersedes Chevrolet Dealer
service Bulletin 86-124 (Section 7A) dated July, 1986.. All
copies of 86-124 should be discarded. New sprag, race,
and hub assemblies are available for use when servicing
1982-86 THM 700-R4 transmissions.
Slipping or loss of drive range condition on a 1982 through 1986 THM 700-R4 transmission may be caused by latching (chatter marks) of the forward
clutch sprag assembly. This condition can result in belling or flaring of the reverse input housing and reaction sun shell. A new sprag, race and hub
assembly is used in production and available for service.
Figure 1 - Transmission Identification Information
July 17, 1986, Julian Date 198 (refer to figure 1) a new
sprag, race, and hub assembly was introduced for all 1987
THM 700-R4 transmission models, including 1987 Service
Replacement Transmission Assemblies (SRTA).
