Suburban 3/4 Ton 4WD V8-305 5.0L (1986)
Clutch: All Technical Service Bulletins
A/T - Slipping/Loss of Drive Range
GMC NUMBER:
86-T-140 7A - Automatic
SECTION:
Transmission
DATE:
March, 1987
SUBJECT:
SLIPPING AND/OR LOSS OF DRIVE RANGE
MODELS:
1982-86 LIGHT DUTY MODELS WITH THM 700-R4 AUTOMATIC TRANSMISSIONS
(MD8)
THIS BULLETIN CANCELS AND SUPERCEDES TRUCK SERVICE BULLETIN 86-B-100 DATED JULY, 1986, ALL COPIES OF WHICH
SHOULD BE DESTROYED.
A slipping or loss of drive range condition on a 1982 through 1986 THM 700-R4 transmission may be caused by slipping 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 is available for service.
Figure No. 1 - TRANSMISSION IDENTIFICATION
DATE OF CHANGE (Figure No. 1)
July 17, 1986, Julian date 198, a new sprag, race, and hub assembly was incorporated into all (including SRTA) 1987 THM 700-R4 transmission
models.
