B&M 70226 TRANSKIT FOR GM 4L80E TRANSMISSION - Manual

1
Installation Instructions
1991+ GM 4L80E Transpak Kit
Part Number 70376
©2012 B&M Racing and Performance Products
9500865-00 Printed in the U.S.A.
Gasket, Case to
Spacer Plate
Gasket, Valve Body to
Spacer Plate
Gasket, Accumulator
Housing Drill (5/64, 3/32, #32)
3/8” X 5/16” ID (red)
Spacer
1/2”L x 51/4” ID
(orange) Spacer
1/2”L x 5/16”ID (green)
Spacer
3/8”L x 1/4”ID (white)
Spacer
Press Control
Solenoid Filter
Press Regulator
(red) & 3rd
Accumulator (blue)
springs
TCC
Solenoid Filter
Shifter
Solenoid Filter
Oil Filter with
Seal
Press Regulator
Retaining Ring
Thank you for choosing B&M, The per-
formance company with over 50 years
experience designing and manufac-
turing quality high performance auto-
motive driveline components.
Before proceeding with the installa-
tion please read all of the B&M 4L80E
Transpak Kit installation instructions
so you will be familiar with the series
of steps required to install this kit. For
other service information on your
4L80E transmission consult the ap-
propriate factory service manual for
your vehicle.
Important Note: Since mid 1992 pro-
duction the 4L80E has been as-
sembled with a heavy duty reusable
oil pan gasket. If your pan gasket is
damaged or you have a 1991 or early ‘92 transmission, you will have to pur-
chase a replacement oil pan gasket at
your parts supplier. An Oil Pan Gas-
ket IS NOT supplied with this kit.
The B&M 4L80E Transpak Kit me-
chanically recalibrates your transmis-
sion to produce firm positive shifts, this
helps reduce clutch pack heat build up
and improves transmission durability.
This kit does not change or modify shift
point RPM in any range. All transmis-
sion shift point RPM and pressure con-
trol functions remain under full PCM
(Powertrain Control Module) control as
they were originally.
No recalibration kit can fix an already
ailing transmission. If your 4L80E is
slipping, overheating, shifting irregularly
or making noise, you should have it repaired before or, in conjunction with
the installation of your B&M 4L80E
Shift Improver Kit.
GENERAL 4L80E INFORMATION
B&M’s 4L80E Transpak Kit was de-
signed to provide firm positive shift
quality and improve transmission du-
rability in original vehicle installations,
especially those with moderate engine
power improvements. This kit was not
designed for and is not suitable for all
out racing applications.
Your 4L80E Transmission is controlled
by the PCM which has full control of
the 4L80E’s operation. All of the pa-
rameters that control fluid pressures,
shift point RPM and TCC (Torque Con-
verter Clutch) Iockup speed have been
preprogramed into the PCM at the
Parts in Kit
Boost Valve Kit