B&M 70225 HI PERF SERVO - Manual

Installation Instructions
High Performance 2-4 Servo
Part No. 70225
© 2002 B&M Racing and Performance Products
Printed in the U.S.A. 9500764-00
parts in so they won’t be lost.
NOTE: It may be necessary in
some instances for transmission
removal. Refer to your vehicles service manual.
DISSASSEMBLY
STEP 1. (Refer to figs 1 and 2)
Remove the servo cover retain-
The B&M High Performance
2-4 Servo is designed for greater
torque capacity with a signifi-
cantly firmer shift in most Gen-
eral Motors TH700 transmis-
sions.
Before beginning, check the
parts list to make sure you have
all the necessary parts. Also
check the tool list. A minimum of
tools are required.
This Servo can be installed in
a few hours by carefully following
directions. Read all instructions
first to familiarize yourself with
the parts and procedures. Work
slowly and do not force any parts.
Automatic transmissions op-
erate at temperatures between
150
o F and 250 o F. It is suggested
that the vehicle be allowed to
cool for a few hours to avoid burns
from hot oil and parts. The ve-
hicle 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!! Try to raise
it 1 - 2 feet so you have plenty of
room to work easily. Also have a
small box or pan handy to put
13 RING, SERVO COVER RETAIN-
ING
14 SEAL, O-RING (2-4 SERVO
COVER) [B&M replacement dark
green or black]
15 COVER, 2-4 SERVO
16 PISTON, 4TH APPLY
17 RING, OIL SEAL OUTER (4TH
APPLY PISTON)
18-30 2ND APPLY PISTON AS-
SEMBLY [B&M High Perfor-
mance 2-3 Servo]
21 SEAL, O-RING (INNER PISTON
HOUSING) [B&M replacement
red]
24 RING, OIL SEAL (2ND APPLY
PISTON OUTER) [B&M replace-
ment black, scarf, large]
30 SEAL, SERVO APPLY PIN
31 SPRING, SERVO RETURN
A CASE SERVO BORE
FIGURE 1. Servo Removal / Installation
Sections of these instructions include material from G.M. service manuals, used and reprinted with the permission of General Motors Corportaion