Corsica L4-121 2.0L (1988)
Accumulator: All Technical Service Bulletins
A/T - 1st to 2nd Gear Shift During Cold Weather
Number:
88-277-7A
Section:
7A
Date:
JULY, 1988
Subject:
1-2 SHIFT DURING COLD WEATHER
Model and Year:
1988 CELEBRITY, CAVALIER, CORSICA, BERETTA
WITH THM 125/125C TRANSAXLE
FIGURE 2
TO:
ALL CHEVROLET DEALERS
This bulletin covers a New 1-2 Accumulator Piston (421) and Seal (420) for vehicles equipped with a THM 125C transaxle to increase shift consistency
during vehicle operation in cold weather conditions. The groove bottom on the 1-2 accumulator piston where the seal is located is flat and the new piston
seal is now made of a soft rubber instead of a hard P.T.F.E. material. (Refer to Figure 2)
Some vehicles equipped with a 1987 THM 125C built between the dates of April 13, 1987 through April 21, 1987 (Julian Dates 103-112), may have a
rolled or misassembled 1-2 accumulator piston seal, resulting in a possible harsh 1-2 shift. This piston seal has a resemblance to the new (rubber) seal
(420). Refer to Chevrolet Dealer Service Bulletin Number 87-231, Section 7A, for additional information. If replacement of this seal built between April
13, 1987 through April 21, 1987 (Julian Dates 103-112) is necessary, the new 1-2 Accumulator Piston (421) and Seal (420) must be used.
