B&M 20261 SHIFT IMPROVER KIT - Manual

9500455-02
Printed in U.S.A.
IMPORTANT MANUFACTURING
DATE CHECK: Hydramatic introduced
a revised transmission case just after
the beginning of the 1988 model year.
If you are installing the B&M TH-400
Shift Improver Kit in a 1988 vehicle
you must check the Julian date stamped
on the transmissions I.D. tag (See
Fig. 1) before attempting to install this
kit. Do not use this kit (#20261) in
transmissions built before November
23, 1987 (Julian date 327), use instead
our #20260 Shift Improver Kit which
is designed to be used with the earlier
style case. If the I.D. tag is unreadable
or missing you will have to remove the
oil pan and valve body from the trans-
mission to determine if your transmis-
sion has an early or late style case
(See Fig. 2). The manufacturing date
check applies only to 1988 transmis-
sions, this kit (#20261) will work cor-
rectly in all subsequent application
years specified in the heading of these
instructions.
We recommend that you read
through the instructions completely
before beginning the installation
so you can familiarize yourself with
the installation procedure and tools
required.
Check the tool list at the rear of
the instructions to make sure no
parts are missing and you have the
tools required to install your B&M
TH-400 Shift Improver Kit.
Installation of the B&M TH-400 Shift
Improver Kit can be accomplished by
anyone with minimum mechanical ex-
perience. It is however, important to
closely follow the instructions. Read
each step carefully before proceeding,
if you do not understand, go back and
read the step again. Installation of the
kit can be accomplished in several
hours.
NOTICE: The B&M TH-400 Shift Im-
prover Kit is not a cure-all for an ailing
transmission. If your transmission is
slipping, chatters or is in poor general
shape, the installation of this Transpak
may worsen the condition. However on
a properly operating transmission in
average condition, the B&M TH-400
Shift Improver Kit will provide the kind
of transmission performance you are
looking for.
When installing your B&M TH-400
Shift Improver Kit there are several
other B&M performance products you
may wish to consider:
TRANSMISSION OIL COOLER We
feel that it is very important that every
vehicle used in heavy duty and hi per-
formance applications (racing, towing,
RV, etc.) should have an oil cooler.
Heat is the major cause of transmis-
sion failures, and an oil cooler is an
inexpensive safeguard against over-
heating and transmission failure. B&M
offers a wide variety of transmission
coolers to suit every application.
TRICK SHIFT PERFORMANCE ATF
#80259 Trick Shift performance auto-
matic transmission fluid is the indus-
try’s only real performance ATF. A
specially blended oil with foam inhib-
itors, extreme pressure agents and
shift improvers, this fluid assures pro-
tection while delivering the fastest pos-
sible shifts. You literally “Pour in per-
formance.”
DRAIN PLUG KIT #80250 The TH-400
transmission is not factory equipped
with a drain plug. The B&M Drain plug
kit is inexpensive and easy to install. It
eliminates the mess of pan removal
and gasket replacement normally re-
quired when changing fluid.
DEEP PAN #20289 B&M offers deep
pans for the TH-400 transmission that
provide 3 to 4 quarts additional oil
capacity which significantly contrib-
utes to the cooling ability of the oil. No
modifications to the dip stick are nec-
essary and a fluid pickup extension is
provided.
TORQUE CONVERTERS B&M offers
a wide range of street torque convert-
Installation Instructions
Shift Improver Kit
for
1988 and Later TurboHydramatic 400
TH-400/TH-475 (3L80/3L80-HD)
Part No. 20261
©B&M Racing & Performance Products 1992