B&M CAST DEEP PAN User Manual
Installation Instructions
4L80E Cast Aluminum
Deep Oil Pan
#70295
© 1998 by B&M Racing and Performance Products
Congratulations! You have just purchased one of the finest cast aluminum pans available for the General
Motors 4L80E Transmission. The B&M
4L80E Cast Aluminum Deep Oil Pan
has been designed to work on all 1993
through 1998 Chevrolet/GMC C/K
series trucks with the 4L80E transmission. The B&M 4L80E Cast Alumi-
num Deep Oil Pan provides several
advantages over stock factory oil pans.
The extra capacity provides increased
oil volume and added cooling, while the
aluminum construction increases case
rigidity. The magnetic drain plug feature allows regular transmission maintenance and oil changes without the
usual mess associated with “dropping
the pan,” and limits ferrous debris from
circulating in the transmission.
This B&M 4L80E Cast Aluminum
Deep Oil Pan can be Installed by anyone with minimum mechanical experience. It is however, important to
closely follow the instructions.
We recommend that you read through
the instructions completely before be-
ginning the installation, so you can familiarize yourself with the installation
procedure. Check the tool list at the
end of these instructions for the tools
required to install your B&M 4L80E
Cast Aluminum Deep Oil Pan.
When installing your Deep Oil Pan
there are several other B&M products
you may wish to consider:
TRANSMISSION OIL COOLER: We
feel that it is very important that every
vehicle should have a transmission oil
cooler in addition to the radiator heat
exchanger. Heat is the major cause of
transmission failures, and an oil cooler
is an inexpensive safeguard against
overheating. B&M offers a wide range
of transmission coolers to suit every
need, which are available at your B&M
dealer.
TRICK SHIFT PERFORMANCE ATF:
Trick Shift performance automatic
transmission fluid is the industry’s
leading performance ATF. A specially
blended oil with foam inhibitors, extreme pressure agents and shift improvers, this fluid assures protection
while delivering the fastest possible
shifts. You literally “Pour in performance.” Available at your B&M dealer.
INTRODUCTION
This Deep Oil Pan can be installed in
about an hour by carefully following the
instructions. Transmission components are precision fit and dirt is the
number one enemy of an automatic
transmission. Cleanliness is very important, so a clean work surface from
which oil can easily be removed is
necessary.
Caution: Automatic transmissions operate at temperatures between 150°F
and 250°F. It is suggested that the
vehicle be allowed to cool off for a few
hours to avoid burns from hot oil and
parts. The vehicle should be off the
ground for ease of installation - jack
stands, wheel ramps or a hoist will
work fine. MAKE SURE VEHICLE IS
FIRMLY SUPPORTED - DO NOT
WORK UNDER A VEHICLE IF IT IS
SUPPORTED BY ONLY A JACK! Try
to raise the vehicle 1-2 feet so you will
have plenty of room to work. Also, have
a small box to put bolts in and a drain
pan to catch oil.
INSTALLATION
STEP 1. Drain the oil pan. Loosen and
remove the oil pan bolts one at a time,
working towards the front of the transmission. Remove the last two bolts
slowly and the pan will tilt down to al-
Printed in the USA 9500642-01
low the last of the fluid to drain. If the
pan sticks to the rubber gasket, pry it
down slightly with a screwdriver to
break the seal before removing the last
two bolts. After the last bolt is removed,
the pan and rubber gasket can be lowered and set aside.
STEP 2. The oil filter will now be exposed. Pull the filter out of the oil
pump, being careful not to bend the
filter pickup tube as it is plastic and
may crack or break. The seal should
remain in the pump - if it comes out
with the filter, remove it from the filter
and carefully reinsert it back into the
pump. B&M recommends that the filter be changed at this time.
STEP 3. The filter must be held in place
with the supplied steel bracket. This
bracket is held in place by one of the
valve body bolts (please see figure
one). Remove the bolt shown and install the bracket (point the bracket towards the side of the vehicle as
shown). Tighten the bolt to 8 lbs-ft do not over tighten!
STEP 4. Lubricate (with transmission
fluid) and install the supplied seal on
the filter tube as shown (please see
figure two). Place the filter and seal in
the tube. Install assembly back into
the oil pump bore being careful not to
damage the seal in the pump.
STEP 5. Clean the original rubber gasket. Install the deep pan using the
original rubber gasket and the supplied
pan bolts and washers (torque to 12
lbs-ft). Do not overtighten as this can
cause leaks. Make sure drain plug is
tight.
STEP 6. Lower vehicle and add six
quarts of Dexron III or B&M Trick Shift
ATF .
STEP 7. Start the engine and place
shifter in the neutral position. Add fluid
until the oil level is at the “add” mark.
Shift the transmission through all gear
positions. Check the oil pan and gaskets for leaks. Once the transmission
has warmed up, add fluid to bring the
level up to “full.” Do not overfill as this
causes foaming and overheating.
Orient filter bracket in
this direction.
Lubricate seal with ATF
This end inserted
into pump
Parts List
1 Aluminum Cast Oil Pan
1 Magnetic Drain Plug
1 Drain Plug Gasket
1 Filter Seal
1 Filter Extension Tube
1 Filter Support Bracket
17 M8-1.25 x 30 mm Bolts
17 Flat Washers
Remove this bolt and
install filter bracket.
Figure One
Filter tube
Make sure the extension is seated all the
way into pump
Figure Two
Tool List
Drain Pan
Gasket Scrapper
3/8” Rachet & 3” Extension
13 mm Socket
3/4” Box Wrench
Flat Blade Screwdriver
6 Quarts ATF
Jack & Jack Stands
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