K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
Technical Service Bulletin # 907D87
Date: 900801
Transfer Case - High Shift Effort
GMC NUMBER:
90-7D-87
GROUP:
7D-TRANSFER CASE
DATE:
AUGUST, 1990
CORPORATE
NUMBER:
067407
SUBJECT:
HIGH TRANSFER CASE SHIFT EFFORT, INSTALLATION OF EASY SHIFT PACKAGE
MODELS:
1988-90 K1, K2, K3 TRUCKS EQUIPPED WITH NEW PROCESS 241 TRANSFER CASE
Some 1988-90 K-Trucks may experience high transfer case shift effort or blockouts when "shifting on the fly" from 2H to 4H under cold weather
conditions (usually less than 32 degrees Fahrenheit). This condition may be corrected by the installation of the synthetic 75W90 gear lube described in
GMC Truck Service Bulletin 89-T-90. If the installation of this fluid does not result in a satisfactory shift effort an "Easy Shift" package may be installed
in the transfer case. This package was. installed in production early in the 1990 model year and will provide reduced transfer case shift effort under cold
weather conditions.
INVOLVED VEHICLES All 1988-90 K1, K2, K3 trucks equipped with New Process 241 transfer case and built prior to the VIN Breakpoints listed
below:
Service Parts Information
The "Easy Shift" package consists of the following parts. All parts listed must be utilized in order to achieve the desired result. Parts must be ordered
individually.
Parts are currently available through GMSPO.
Service Procedure
