C 1500 Truck 2WD V8-350 5.7L (1989)
Technical Service Bulletin # 90C357A
Date: 920101
Campaign - A/T Fluid Containment
Number:
90C35
Section:
7A
Date:
JAN. 1992
Subject:
PRODUCT CAMPAIGN 90C35 - AUTOMATIC TRANSMISSION FLUID CONTAINMENT
Model and Year:
1988-90 C/K TRUCKS
To:
All Chevrolet Dealers
DEFECT INVOLVED
A product improvement was made on all 1991 C/K trucks equipped with automatic transmissions to help in maintaining the proper transmission fluid
level. Transmission fluid level is very important to transmission life and performance.
Also, it has come to our attention that some owners are pulling trailers heavier than the vehicle is equipped to pull or otherwise loading their vehicles
with loads greater than that specified for the vehicle as it is equipped. These conditions can result in abnormal pressure build-up in the transmission and
the possibility of transmission fluid coming out the filler tube onto hot engine parts.
The possibility of a transmission fluid fire is remote. However, we wanted our owners to have the benefits of the improvements which address this
concern, and the maintenance of a proper transmission fluid level.
These improvements consist of (1) revising the transmission fluid level indicator (dipstick) markings so they can be more easily understood, (2) adding a
seal at the fill tube inlet end to help prevent fluid from coming out of the fill tube, and (3) revising the fluid level checking procedure in the owner's
manual to provide for a "cold" fluid level check. (Note: A "hot" check must follow when fluid is added during a cold check.)
To help prevent conditions that could cause transmission pressure build-up and the possibility of transmission fluid coming out of the fill tube, Chevrolet
Motor Division is providing, to owners, a new dipstick with a lock-seal top and new owner manual instructions and graphics for checking the automatic
transmission fluid level.
Vehicles Involved
Involved are 1988-90 C/K trucks equipped with 4L60 (RPO MD8) or 3L80 (RPO M40) automatic transmissions built within the following VIN
breakpoints:
PLANT
YEAR
MODEL
PLANT
CODE
FROM
THROUGH
1988
C/K Truck
Pontiac East
"E"
JE100001
JE211189
1988
C/K Truck
Fort Wayne
"Z"
JZ100013
JZ331451
1988
C/K Truck
Oshawa
"1"
J1100014
J1309125
1989
C/K Truck
Pontiac East
"E"
KE100001
KE282856
1989
C/K Truck
Fort Wayne
"Z"
KZ100001
KZ285940
1989
C/K Truck
Oshawa
"1"
K1100016
K1262167
1990
C/K Truck
Pontiac East
"E"
LE100002
LE265301
1990
C/K Truck
Fort Wayne
"Z"
LZ100001
LZ276058
1990
C/K Truck
Oshawa
"1"
L1100015
L1265823
Owner Notification, Dealer and Parts Info.
OWNER NOTIFICATION
