B&M 70365 TRANSPAK - Manual (Page 4)

4
converter failures can be traced
directly to excessive heat. The B&M
transmission temperature gauge can
save you a costly repair bill by
warning you of an overheated
transmission. The B&M temperature
gauge comes with all necessary
hardware and is easy to install.
Preparation
Automatic transmissions operate at
temperatures in the range of 150 and
250 Fahrenheit. We recommend the
vehicle be allowed to cool for
several hours before disassembly
to avoid burns from hot oil and
parts. 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. Contam-ination in the
valve body or pressure regulator
valve train can result in serious
transmission damage and/or
unpredictable operation.
Transmission compon-ents 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
fur-ther, 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