B&M 70360 SHIFT IMPROVER KIT - Manual (Page 4)

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The vehicle should be raised so
there is at least 2 feet ground
clearance for ease of installation
and safety.
MAKE SURE THE VEHICLE IS
RIGIDLY AND SECURELY
SUP-PORTED,
JACK STANDS,
WHEEL RAMPS OR A HOIST
WORK BEST, DO NOT USE JACKS
ALONE.
Have an oil drain pan ready to
catch oil and a tray on which to put
small parts so they won’t get lost.
It can never be said enough: Make
sure you have a clean, dust free place
to work. Burrs and dirt are the number
one enemies of an automatic
transmission. Contamination in the
valve body or pressure regulator valve
train can result in serious
transmission damage and/or
unpredictable operation. Transmission
components are precision fit, work
slowly and do not force any parts.
This kit contains all parts necessary
to obtain two different shift feel levels
of performance depending on the
intended use:
1. Heavy Duty level; Towing, campers
and, 4-wheel drive vehicles. Shift feel
is firm and positive.
2. Street level; Dual purpose
performance vehicles, street and strip
performance cars. Street level
produces the firmest shift feel.
Disassembly
STEP 1. Position your drain pan under
the transmission to catch ATF.
Remove oil pan by first removing rear
pan bolts, then work towards the front.
Loosen but do not remove the three
front bolts. If the pan sticks to the
gasket, insert a flat screwdriver
between the pan and case and pry
down gently to break pan loose. Now
slowly back out the front three bolts
to permit draining the ATF. Remove
pan gasket material from pan and case
flanges.
STEP 2. Remove oil filter from case
by gently pulling it straight down. If
filter is clogged or if transmission has
over 50,000 miles on it, the filter and
filter seal should be replaced.
STEP 3. There are several different
wiring harness configurations used on
the 4L60E. Before proceeding further,
make a sketch and some notes
describing your particular unit,
re-cording which connectors go to
which solenoid (See Fig. 2). Notice
how the connectors and wires are
color coded. Remove connectors from
pressure switch assembly and
solenoids then tie the wires up out of
the way.
STEP 4. Remove all except the center
valve body bolt and the 2 pressure
switch bolts marked X (See Fig. 2) If
you do remove all five bolts from the
pressure switch, be sure to recover
all 5 switch assembly O-ring seals as
it is removed. Hold the valve body
firmly with one hand and remove the
remaining bolt slowly. Notice how the
Manual Valve Link is engaged to the
Manual Valve as you remove the valve
body from case. There are seven
check balls in the valve body along
with several pints of oil. Have your
drain pan ready to catch the oil and
check balls (should they fall out). Save
all the check balls in a secure place
where they won’t get lost.
STEP 5. Remove the separator plate
support plate. Remove the 1-2
accumulator housing while holding the
separator plate up to the case. Then
slowly lower the separator plate and
retrieve the check ball located above
the plate. Important: Make a note of
the color and location of the 1-2 and
2-3 accumulator springs for correct
reassembly (See Fig’s. 7-10 ).
Remove all old gasket material from
separator plate, valve body and case
surfaces. STEP 6. Remove pin from 3-4
accumulator piston in case. Remove
3-4 accumulator piston from case
bore. Remove 1-2 accumulator piston
from 1-2 accumulator housing. Be
careful not to damage piston seals or
scratch piston bores while removing
pistons.
Pressure Regulator
STEP 7. Heavy Duty and Street;
Remove the snap ring at the end of
the pressure regulator bore (See Fig.
3). Use a screwdriver to push against
the spring loaded Boost Valve sleeve
while removing the retaining ring.
Remove Boost Valve Sleeve and Valve
and the Pressure Regulator Spring.
The Pressure Regulator Valve may fall
out but it does not have to be removed.
Reassemble the pressure regulator
assembly as shown (See Fig. 4) using
the GREEN Pressure Regulator Spring
from the kit. Use the new retaining ring
included with kit. Important: Make sure
the retaining ring is fully seated in its
groove when assembled. If the
retaining ring is not fully seated in its
groove, the pressure regulator
assembly will blow out of its bore
resulting in NO LINE pressure.
Modifications
STEP 8. Carefully remove the snap-in
solenoid oil filters from the separator
plate. Using the supplied drills, enlarge
the holes in your separator plate as
shown in (Fig. 5). Before drilling, mark
the hole locations and drill size on the
separator plate and double check
them
against the illustration. Make sure to
use the correct drill size specified for