Suburban 3/4 Ton 4WD V8-305 5.0L (1986)
Fluid Pump: Customer Interest
A/T - Fluid Leak Near Front Pump (Bushing Walkout)
GMC NUMBER:
88-T-199
GROUP:
7A - Automatic Transmission
DATE:
March, 1989
CORPORATE
NUMBER:
877143R
SUBJECT:
PUMP FLUID LEAK CAUSED BY FRONT PUMP BUSHING WALKOUT FORCING FLUID PAST PUMP SEAL
MODELS:
1978-1988 C,K,P,R AND V TRUCKS, G VANS EQUIPPED WITH THM 400/475 AUTOMATIC TRANSMISSIONS
Figure No. 1
Figure No. 2
Some THM 400/475 models may experience a fluid leak coming from the converter or oil pump area. This could be caused by the front pump bushing
walking forward, resulting in fluid being forced past the pump oil seal. A new bushing was introduced that has an increased hardness specification which
