G 10 Van V8-379 6.2L DSL (1987)
Case: All Technical Service Bulletins
A/T - THM 700R4 Slipping or Loss of Drive
Number:
87-107
Section:
7A
Date:
APRIL 1987
Subject: SLIPPING OR LOSS OF DRIVE
THM 700-R4 WITH AUXILIARY VALVE BODY
Model and Year:1987 PASSENGER CARS WITH THM 700-R4 TRANSMISSION
1987 TRUCKS & VANS WITH THM 700-R4 TRANSMISSION
FIGURE 1 - AUXILIARY ACCUMULATOR VALVE BODY
TO:
ALL CHEVROLET DEALERS
A new auxiliary accumulator valve body (Figure 1 #377) and a
new cover (Figure 1 #371) went into production to prevent
the accumulator piston pin from working its way out of the
auxiliary valve body. If the accumulator piston pin comes
out of either end of the auxiliary valve body the following conditions could occur:
1.
Loss of Drive
2.
Slipping in Drive
3.
Burned forward and overrun clutches
FIGURE 2 - TRANSMISSION I.D. NAMEPLATE INFORMATION
Beginning January 27, 1987 (Julian Date 027, Figure 2) all
THM 700-R4 transmissions were produced with an auxiliary
accumulator valve body assembly that has a stepped bore at
one end of the piston pin and a new cover with an oval
instead of a round exhaust hole at the other end of the pin to retain the accumulator piston pin in place.
