V 2500 P/U 4WD V8-350 5.7L (1987)
Valve Body: Customer Interest
A/T - Harsh Park/Neutral to Reverse Engagement
GMC NUMBER:
88-T-116
GROUP:
7A - Automatic Transmission
DATE:
May, 1988
CORPORATE
NUMBER:
877125
SUBJECT:
HARSH PARK/NEUTRAL TO REVERSE ENGAGEMENT SHIFT FEEL
MODELS:
1987-1988 C,K,R,V AND G MODELS EQUIPPED WITH THM 400 AUTOMATIC TRANSMISSION AND HAVE A GVWR OF
10,000 LBS AND UNDER
TRANSMISSION MODELS:
FDA, FFA, FMA, FTA, FWA, FZA, LKA, LMA, LTA, LUA, LWA, LZA, FJA, FNA, FPA, FUA, FYA, LBA, LDA, LHA, LJA, FCA, LFA, LRA, LSA
BULLETIN COVERS
Service and parts information concerning harsh park or neutral to reverse engagement shift feel on vehicles with a Gross Vehicle Weight Rating
(GVWR) of 10,000 lbs. and under. Included are: control valve assembly, valve body gaskets, valve body spacer plate, case assembly with an additional
check ball and orificed cup plug.
NOTICE
The new case assembly, control valve assembly, gaskets, and check ball will be included on all THM 400/475 models. However, only the vehicles that
have GVWR of 10,000 lbs. and under will have the new garage shift spacer plate and orifice cup plug. The vehicles with GVWR over 10,000 lbs. have
increased clutch capacity requirements which may result in burned clutches if this garage package is installed.
IT IS NOT RECOMMENDED THAT VEHICLES WITH GVWR OVER 10,000 LBS. BE UPDATED WITH THIS PACKAGE.
FIGURE 1 - THM 400 TRANSMISSION IDENTIFICATION INFORMATION
DATE OF CHANGE (Figure No. 1)
Beginning November 23, 1987 (Julian Date 327) all THM 400 transmissions with a GVWR of 10,000 lbs. and under were built with a new reverse
engagement package.
