G 30 1 Ton Van L6-250 4.1L VIN D 2-bbl (1983)
Clutch: All Technical Service Bulletins
A/T - Piston Seals Leaking
Number:
88-94-7A
Section:
7A
Date:
Dec., 1987
Subject:
PISTON SEALS CUT/LEAKING - SERVICE AND PARTS INFORMATION FOR NEW ALUMINUM DIE CAST PISTONS
Model and Year:
1978-88 MODELS WITH THM 400/475 TRANSMISSIONS
TO:
ALL CHEVROLET DEALERS
This bulletin covers service and parts information for new aluminum die cast pistons used in the THM 400/475 forward, direct, and intermediate
clutches. The new pistons reduce the occurrence of a cut and/or leaking seal.
FIGURE 1 - THM 400 TRANSMISSION IDENTIFICATION INFORMATION
DATE OF CHANGE:
(Figure 1)
July 21, 1987, (Julian date 202) for all 1987 and 1988 THM 400/475 transmission models.
FIGURE 2
SERVICE ACTION:
