B&M 70226 TRANSKIT FOR GM 4L80E TRANSMISSION - Manual (Page 6)

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reinstall the piston.
STEP 13. Heavy Duty and High Per-
formance Street levels: Replace the
stock 3rd Accumulator Spring with the
BLUE 3rd Accumulator Spring included
in the kit (See Fig.6).
STEP 14. Stick the Accumulator gas-
ket in place on the spacer plate with
petroleum jelly. Place the accumula-
tor springs and housing onto valve body.
Install six (6) M6 x 65mm (Late model)
of five (5) M6 x 65mm and one (1) M9
x 100mm (early model) bolts and turn
them down evenly. Make sure all of
the Spacer Plate and Gasket holes are
lined up with the Valve Body holes then torque the Accumulator Housing bolts
to 11 Nm(8 lb ft).
STEP 15. Check Balls: If the trans-
mission is in the vehicle it is easiest
to place the Check Balls (See Fig. 7)
in the appropriate positions on the
Spacer Plate and then install the Valve
Body. If the transmission is on the
bench then placing the Check Balls in
the case cavities (See Fig. 8) is the
correct placement method. Use a dab
of Petroleum Jelly to hold the Check
Balls in place. Most transmissions
will have eight (8) Check Balls al-
though, export models and some early
models have nine (9). Only eight (8)
Check Ball positions are used with
this kit regardless if you originall
had nine (9) Check Balls or eight
(8).
STEP 16. Make sure the Front Servo
(See Fig. 8) is correctly installed if it
was removed or fell out of its bore while
the Valve Body was removed. Wiping
the bore dry and then coating the pis-
ton with petroleum jelly will usually help
to hold the Servo Piston up in the case
during Valve Body installation.
STEP 17. Make sure the Spacer Plate
gaskets are properly positioned and the
Check Balls are in place. Carefully as-
semble the Valve Body to Case while
HD=Heavy Duty Level HPS=High Performance Street Level
There were 3 Spacer Plate designs used in the 4L80E from 1991 to 1996. The outline and some features on
your Spacer Plate may appear slightly different when compared to the illustration. The drilled orifice locations
however are the same for all 1991 through 1996 versions.
Using an indelible pen, first mark the orifices to be drilled on your spacer plate and then double check the
marked locations against the above illustration. Drill the smaller orifice sizes first. Drilling the orifices larger
than specified will result in unpredictable shift characteristics and possible transmission damage.
HD & HPS
.078 (5/64”)
HD .094 (3/32”)
HPS .116 (#32)
HD .078 (5/64”)
HPS .094 (3/32”)
HD .094 (3/32”)
HPS .094 (3/32”)
HD & HPS
.094 (3/32”)
HD .078 (5/64”)
HPS .094 (3/32”)
HD & HPS
.116 (#32)
Figure 3. Spacer Plate Modification