A/T - 700R4 Valve Body Interchange
BULLETIN: # 118TRANSMISSION: 700R4
SUBJECT: Valve Body Interchange
APPLICATION: GM
Late model 700-R4 valve bodies can be exchanged if the spacer plate and checkball locations are matched to valve body. To determine proper interchange refer to the four steps on the following pages.
STEP 1: IDENTIFY THE YEAR OF THE VALVE BODY.
1982-1987 Valve Bodies
1988 or Later Valve Bodies
STEP 2: IDENTIFY THE VALVE BODY TYPE.
This is necessary to match the valve body to the spacer plate. There are two types for each year (87 and later) determined by the design of the line bias valve.
STEP 3: IDENTIFY THE SPACER PLATE.
The spacer plate must be matched to the year and type of the valve body.
PLATE CODES
Beginning in 1987 GM started using 2 letter codes to identify the spacer plates. The first letter of the code is used to determine the year of the plate.
If the first letter is:
A = 1987 cars and trucks
B = 1988 cars and 1988,1989, 1990 trucks
C = 1989, 1990 (cars only)
D = 1990 and later diesels
STEP 4: IDENTIFY THE PROPER CHECK BALL LOCATION ACCORDING TO THE YEAR OF THE VALVE BODY AND PLATE.
Auxiliary Valve Body - 1987 Only
Auxiliary Valve Body - All Years
1988 and Later Models
1. The worm tracks in the auxiliary valve body cases are the same from 87-92 model years so the valve bodies & plates will interchange from year to year.
2. The type # 1 valve bodies and plates are preferred in severe duty vehicles.
3. If you have an 89 or later and you want to use a TCC valve use an 87 or 88 valve body and plate.
4. Keep in mind there are also calibration differences between valve bodies that will not allow acceptable driveability characteristics. (i.e. Using a diesel valve body on an S-10 etc.)