B&M 20260 SHIFT IMPROVER KIT - Manual (Page 4)

Detent solenoid Detent solenoid gasket
(not used with square
can solenoids)
Pan bolt may be used to hold
separator plate in position
during removal and reassem-
bly of detent solenoid
Figure 8
4
Figure 7
time pulling straight down on the gover-
nor tubes (See Fig. 6). Place the valve
body in the oil pan to avoid contamina-
tion. NOTE: The front servo may fall out
of the case, if it does see Figure 7 for
reassembly order. Use grease or petro-
leum jelly to hold the servo components
in place.
STEP 5. Use one (1) pan bolt to hold the
separator plate in place while removing
the solenoid. Remove the two bolts
holding the detent solenoid (See Fig.
8) and allow the solenoid to hang by its
wire. Remove the pan bolt and carefully
lower the separator plate. Be careful
not to loose the six (6) 1/4" steel check
balls that are on top of the separator
plate. The check balls will be used over
again. Carefully remove all gasket ma-
terial from valve body and oil pan sur-
faces of the case and valve body. All old
gasket material must be removed be-
fore the valve body is reinstalled.
MODIFICATIONS
STEP 6. 2-3 Accumulator:
Heavy Duty : No modification required
for this level.
Street: Very careful clamp the valve
body in a vise and compress the accu-
mulator enough to remove the E-ring
(See Fig. 9). Open the vise slowly and
remove the valve body. Remove the
piston and accumulator spring, then
reinstall the piston and the E-clip.
STEP 7. Separator Plate:
Heavy Duty: Drill the B&M Separator
Plate orifice indicated in Figure 10
using the 5/32" (.156") drill supplied in
kit.
Street: Drill the B&M Separator Plate
orifices indicated in Figure 10 using
the 3/16" (.188") drill supplied in kit.
STEP 8. Thoroughly clean the valve
body and separator plate in clean sol-
vent to remove any contamination. Re-
move any old gasket material stuck on
the valve body channel surface.
REASSEMBLY
STEP 9. Check Ball Placement:
Install the plate and gasket against the
case and use a clean pan bolt to hold it
in position for now (See Fig. 8).
STEP 11. Carefully examine Detent
Solenoid.
Oval can solenoid: Make sure orifice
disc is present and properly seated in
the casting (See Fig 12). If the disc is
missing the transmission will be in
passing gear all the time. Install sole-
noid into position along with the new Install check balls in the locations
shown in Figure 11 as follows:
Heavy Duty: Six check balls, one each,
in locations 1-6.
Street: Three check balls, one each, in
locations 4,5,6 (do not install check
ball #1, 2 or 3).
STEP 10. Place upper valve body gas-
ket (has “C” punched in it) on to the
B&M separator plate (use grease or
petroleum jelly to hold it in place).
Remove E-clip with screwdriver
Street level only
Figure 9