B&M HI PERF SERVO User Manual
Installation Instructions
High Performance 2-4 Servo
Part No. 70225
© 2002 B&M Racing and Performance Products
The B&M High Performance
2-4 Servo is designed for greater
13 RING, SERVO COVER RETAIN-
ING
torque capacity with a significantly firmer shift in most General Motors TH700 transmis-
14 SEAL, O-RING (2-4 SERVO
COVER) [B&M replacement dark
green or black]
sions.
Before beginning, check the
15 COVER, 2-4 SERVO
parts list to make sure you have
all the necessary parts. Also
check the tool list. A minimum of
tools are required.
16 PISTON, 4TH APPLY
17 RING, OIL SEAL OUTER (4TH
APPLY PISTON)
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.
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]
Automatic transmissions operate at temperatures between
150oF and 250oF. It is suggested
24 RING, OIL SEAL (2ND APPLY
PISTON OUTER) [B&M replace-
ment black, scarf, large]
that the vehicle be allowed to
cool for a few hours to avoid burns
30 SEAL, SERVO APPLY PIN
from hot oil and parts. The vehicle should be off the ground for
ease of installation. Jack stands,
31 SPRING, SERVO RETURN
A CASE SERVO BORE
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
Sections of these instructions include material from G.M. service manuals, used and reprinted with the permission of General Motors Corportaion
Printed in the U.S.A.
parts in so they won’t be lost.
NOTE: It may be necessary in
some instances for transmission
removal. Refer to your vehicles
FIGURE 1. Servo Removal / Installation
service manual.
DISSASSEMBLY
STEP 1. (Refer to figs 1 and 2)
Remove the servo cover retain-
9500764-00
ing ring (13).
STEP 2. Remove Servo Cover
and O-ring seal (14). The only
way to remove the servo cover
easily is to first work the cover out
until the o-ring is visible through
the two slots in the case. Hook
the o-ring with a small screwdriver, then remove the o-ring by
breaking it and pulling it from the
cover. The cover can then be
removed.
STEP 3. Remove the servo pin
retaining ring (18), washer (19),
and apply pin spring (20).
STEP 4. Remove the 2nd apply
piston pin (29).
STEP 5. Remove the retaining
ring (28).
STEP 6. Remove the cushion
spring retainer (27) and cushion
spring (26).
INSPECT
STEP 7. Inspect springs for dis-
tortion and replace as necessary.
IMPORTANT: Check servo
bores (A) in the case for any
wear or sharp edges which may
cut the servo seals (see fig. 1).
13 2ND APPLY PISTON
ASSEMBLY
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 (4TH
APPLY PISTON)
18 E-RING, RETAINING (SERVO
APPLY PIN)
19 WASHER, SERVO APPLY
PIN
20 SPRING, SERVO APPLY PIN
21 SEAL, O-RING (INNER
PISTON HOUSING) [B&M re-
placement red]
22 HOUSING, SERVO PISTON
INNER [B&M High Perfor-
mance 2-4 Servo]
23 RING, OIL SEAL INNER (2ND
APPLY PISTON) [B&M re-
placement black, scarf,
small]
24 RING, OIL SEAL OUTER
(2ND APPLY PISTON) [B&M
replacement black, scarf,
large]
25 PISTON, 2ND APPLY [B&M
High Performance 2-4
Servo]
26 SPRING, SERVO CUSHION
27 RETAINER, SERVO
CUSHION SPRING
28 RING, RETAINING (CUSION
SPRING RETAINER)
29 PIN, SERVO APPLY
30 SEAL, SERVO APPLY PIN
31 SPRING, SERVO RETURN
FIGURE 2. Servo Disassembly / Assembly
ASSEMBLY
STEP 8. (Refer to figs 1 and 2 for
assembly) Install cushion spring
(26) into the B&M High Performance 2-4 Servo Piston (25),
cushion spring retainer (27) on
top of the cusion spring.
STEP 9. Compress spring retainer just past the retaining ring
groove in the B&M High Performance 2-4 Servo Piston (25) and
install the retaining ring (28).
STEP 10. Install the B&M High
Performance 2-4 Servo Piston
(25) on the 2-4 servo apply pin
(29) with spring (20), washer (19)
and retaining E-ring (18) on the
2-4 servo apply pin (29).
22 B&M High Performance 2-4 Servo Housing
25 B&M High Performance 2-4 Servo Piston
21 O-ring (inner piston housing)
seal (red)
23 Ring, oil seal inner (2nd apply piston)
(black, scarf, small)
14 O-ring (2-4 servo cover)
seal (dark green or black)
24 Ring, oil seal inner (2nd apply piston)
(black, scarf, large)
FIGURE 3. B&M High Performance 2-4 Servo (Parts)
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