C 3500 Truck 2WD V8-454 7.4L (1990)
Accumulator: All Technical Service Bulletins
A/T - Double or 1-2 Shift Shudder
Number:
91-360-7A
Section:
7A
Date:
JULY 1991
Corporate Bulletin No.: 177115
Subject:
1-2 SHIFT SHUDDER, HARSH OR DOUBLE FEEL
Model and Year:
1990 C, K, R, V, G AND P TRUCKS WITH 3L80 AND 3L80-HD AUTOMATIC TRANSMISSION
1991 C, K, R, V, G AND P TRUCKS WITH 4L80-E AND 4L80-EHD AUTOMATIC TRANSMISSION
TRANSMISSION MODELS: ALL MODELS
Service Information:
Some HYDRA-MATIC 4L80-E/4L80-EHD and 3L80/3L80-HD transmissions may experience a 1-2 shift shudder or harsh double feel. This is caused
by fluid leaking past the rear accumulator piston seals. A new piston and ring assembly package was released that eliminates this condition.
Figure 1
Date of Production Change:
(Figure 1)
Starting April 18,1991 (Julian Date 108) all HYDRA-MATIC 4L80-E/4L80-EHD models were built with the new Accumulator Piston and Seals.
