B&M 70239 SHIFT IMPROVER KIT - Manual (Page 4)

MODIFICATIONS
STEP 6. Using the supplied drills,
enlarge the holes in your separator
plate as indicated in Fig. 4. Carefully
deburr the holes after drilling.
STEP 7. Rinse off valve body with
clean solvent to remove any dirt or
grit. Move to a clean working area.
The valve body consists of precision
fit components which will not tolerate
dirt or burrs.
STEP 8. Heavy Duty and Street;
MTV upshift valve (See Fig. 5.)
Remove the pin at the end of the
MTV upshift valve bore. Remove the
plug, valve and spring from the bore.
Set the spring aside (it will not be re-
used.) Re-install the valve, plug and
pin in reverse order of removal.
STEP 9. Street Only; Line bias
valve.
Compress and remove the large
roll pin retaining the line bias valve
(See Fig. 5.) Take care to not distort
the roll pin more than is required to
remove it. Remove the aluminum plug,
valve and spring from bore. The stock
spring will not be re used. Insert the
blocker rod from the kit into the bore.
Install the valve and aluminum plug
as removed. If the aluminum plug
extends into the roll pin hole, remove
the blocker rod and grind or file a
small amount from either end of the
blocker rod until the aluminum plug
clears the roll pin hole when all parts
are installed.
STEP 10. Heavy Duty and Street;
Pressure regulator.
Remove the snap ring at the end
of the pressure regulator bore in the
oil pump assembly (See Fig. 6.) Use
a screwdriver to hold the pressure
regulator assembly while removing
the retaining ring. If the sleeves stick
in the bore, lightly rap the sleeve with
a small rod and a mallet (piece of
2X4.) Remove two sleeves with valves
and the pressure regulator spring.
The pressure regulator may fall out
but it does not need to be removed.
Reassemble the pressure regulator
assembly using the BLUE spring
from the kit (See Fig. 7.) Use the
new retaining ring from the kit. Make
sure the retaining ring is firmly seated
in its groove when assembled.
4
CAUTION: The pressure regu-
lator valve train MUST be installed
in the proper order with the
sleeves and valves oriented in
the indicated directions. There are
several ways the sleeves and valves
can be installed, however, only the
orientation shown will work properly.
Improper installation will cause low
line pressure, resulting in slipping
clutches and burned friction elements.
It is very important to reassemble
the pressure regulator correctly to
insure proper operation of the
transmission.Take a little extra time
with this step and work slowly.This is
a precision fit valve assembly so do
not force the valves back into the
bore. During reassembly, you can
smear grease on the valve and spring
before you insert them into the bore
to hold them in place while you install
the boost valve assembly.
To ease installation a thin blade
Figure 4
screwdriver can be used to hold the
assembly up into the bore while you
install the snap ring. Place the snap
ring around the screwdriver and slide
it up into place with the snap ring
pliers. Be sure the snap ring goes into
the groove and is not against the step
in the bore.
Pry lock tab aside
to remove plug
Figure 3
Drill 1/8" (.125")
Drill 1/8" (.125")
Drill 3/32" (.094")
Wiring
harness plug
NOTE: additional model year I.D.
1982 thru mid-87 (2) holes
mid-1987 to 1988 (2) holes
1988 and later (1) hole