S15/T15 2WD P/U L4-119 1.9L (1985)
package may be unclear when explaining which spacer plate gaskets are appropriate for use.
SERVICE PROCEDURE:
(Figure 2)
Two sets of spacer plate gaskets are supplied with each transmission overhaul service kit. One set of gaskets is for use on model years 1982 through
1986, and the other set is for use on model years 1987- 1989. The difference between the two sets of gaskets is the addition of holes in 1987 to
accommodate an auxiliary valve body. Transmissions produced Start of Production 1987 model year must use gaskets with holes for an auxiliary valve
body even if an auxiliary valve body is not used.
If a 1987 or later transmission does not have an auxiliary valve body - the spacer plate covers up the unused holes in the spacer plate gaskets.
NOTICE:
If the incorrect (1982-1986) gasket set is used on a 1987-1989 model year transmission, with or without an auxiliary valve body, the third
clutch exhaust passage will be blocked. This may cause slip ping or flaring during a 3-2 shift, a delayed 3-2 downshift, or a burned 3-4
clutch.
SERVICE PARTS INFORMATION:
Part #
Part #
Model Year
Gasket Set Only
Overhaul Kit
1982-1986
8642993
8649995
1987-1989
8657938
8649995
Parts are currently available from GMSPO.