Installation Instructions
Transpak
Fits: 1966-1977 Chrysler, Dodge, Plymouth
w/Torqueflite A727 and A904 Automatic Transmission
Catalog # 10228
WORK SAFELY! For maximum safety, perform this installation on a clean, level surface and with the
engine turned off. Place blocks or wedges in front of and behind both rear wheels to prevent
movement in either direction.
CAUTION: To avoid any possibility of bodily injury or damage to vehicle, do not attempt installation
until you are confident that the vehicle is safely secured and will not move.
The 10228 Transpak fits all Chrysler three speed Torqueflite and Loadflite transmissions between
1962 and 1978. These are the A-727, A-904, A-998 and A-999 transmissions. (The A-998 and A-999
are heavy duty, eight cylinder versions of the A-904 transmission that are essentially identical in
appearance.) None of these transmissions have lock-up torque converters.
NOTE: The Transpak is not a cure-all for an ailing transmission. If your transmission is slipping or in
poor general shape, the installation of a Transpak Kit may worsen the condition. However, on a
properly operating transmission in average condition, the Shift Improver Kit will provide the kind of
transmission performance you're looking for.
INTRODUCTION
NOTE: Transmission components and valves are precision fit parts. Burrs and dirt are the number
one enemies of an automatic transmission. Cleanliness is very important, so a clean work area or
bench is necessary. We suggest a clean work bench top from which oil can easily be cleaned or a
large piece of cardboard.
This kit contains all parts necessary to obtain three levels of performance depending on intended use:
Heavy Duty: For towing, campers, motorhomes, police, taxi, etc. Firm shift feel without loss of driver
comfort.
Street/Strip: Street driven hi-performance cars, extra firm shift feel, minor loss of driver comfort.
Off-Road Racing: High performance vehicles on loose surfaces where full manual control of shifting
is desired. Optional feature for 3 speed transmission only (NOTE: complete ALL steps that indicate
“FOR 3-SPEED OFF ROAD RACING APPLICATIONS ONLY”).
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DISASSEMBLY
1. Drain and remove the transmission oil pan. If you do Fig. 1 Valve
not have a drain plug, you should consider installing a Body
B&M pan Drain Plug Kit, #80250, at this time. Remove Bolts
the valve body (See Figure 1).
2.
Remove and discard the filter. Carefully disassemble the valve body and lay out all the springs and
valves as removed on a clean rag or paper towel (See Figure 2). Thoroughly clean each part (brake
cleaner works well. Replace the stock limit valve spring with the supplied B&M limit valve spring (See
Figure 2).
Fig. 2
3. Install the supplied B&M drill guide as shown in Fig. 3
figure 3. Wrap masking tape 3/8” above the tip of
the supplied 3/16” diameter drill to use as a drill
guide stop. Then drill through the hole in the guide
keeping in mind the casting wall will be removed;
but DO NOT drill through the valve body. If the
indicated passage has a restrictor, drill the passage
clear with the supplied #32 (.116 diameter) drill
(See Figure 3).
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4. Referring to figure 2, reinstall the 2-3 shift valve and spring and the 1-2 shift valve and spring.
Reinstall the 1-2 shift control valve and spring. For 3-SPEED OFF-ROAD RACING APPLICATIONS
ONLY install the supplied B&M 1/4” check ball inside the spring on top of the 1-2 shift control valve.
DO NOT install the 1/4” check ball in Heavy Duty and Street applications. Make sure all the valves
and springs move freely, then install the down shift assembly and end plate. Reinstall the booster
assembly (some early models do not have a spring), booster valve, sleeve, and end plate.
5. Modify the throttle valve as indicated in Grind away 5/32” off stem end
Figure 4 and install the into the valve body 9/32” of valve and deburr (remove
sharp edges from end)
(See Figure 2).
Install the supplied red
throttle pressure spring
6. Reinstall the Pressure Regulator Valve using the supplied B&M Pressure Regulator Spring (See
Figure 2).
7. Reinstall the original converter/lube oil switch valve and spring then set the valve body aside.
8. FOR 3-SPEED OFFROAD RACING APPLICATIONS ONLY: Replace the 1-2 shift governor plug
with B&M’s governor plug (See Figure 2).
9. Drill the separator plate as shown here in figure 5.
Fig. 5
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10. 4 Speeds ONLY: Install the piston as removed (See Fig. 6 B&M 3-4 accumulator spring
Figure 6) with the non-hollow end into the bore, replacing
Original piston
the original spring with the supplied B&M 3-4 accumulator
spring. Install the B&M aluminum cup orifice plug in the
location shown in Figure 6 below the deck surface.
B&M aluminum
cup orifice plug
11. Remove check balls from the check ball location checkball Fig. 7
#1 and check ball location #2 from the transfer plate location #1
(remove ball)
(See Figure 7).
EXCEPTION FOR JEEPS: DO NOT remove check
ball from check ball location #2. checkball
location #2
(remove ball
except for
Jeeps)
12. Referring to Figure 8, make sure all indicated
Fig. 8
checkballs are of the proper size and location as
indicated.
13. Reassemble the separator plate onto the transfer plate stiffener plate must be
Fig. 9
as shown in Figure 9. installed as shown (stiffener
plates vary in appearance
(1970 and later shown))
NOTE: Figure 9 shows the 1970 and later model stiffener
plate, other year model stiffener plates may vary in
appearance.
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14. Use a 3/16” Allen wrench and turn the Fig. 10
pressure regulator adjustment screw
adjustment screw (See Figure 10) spring seat
clockwise until the pressure regulator
spring seat is sitting flush against the inside
edge of the spring retainer. Then turn the
adjustment screw five (5) full turns
counterclockwise for heavy duty
applications or seven (7) full turns for street
level and 3-speed off-road racing
applications.
inside edge
15. Remove 2nd gear accumulator spring (See
16. Install the B&M blocker rod as shown
Figure 11) and discard. 727 CASE ONLY: below (See Figure 12):
install steel orifice plug just below the surface
in the indicated hole, using a flat nose punch.
Fig. 11 Fig. 12
727 CASE ONLY:
install steel orifice plug here
2nd gear accumulator
spring (discard) B&M blocker rod
17. FOR 3-SPEED OFFROAD RACING Fig. 13
extension housing
APPLICATIONS ONLY band strut
(Manual down shifts to low gear at any speed)
!!NOT RECOMMENDED FOR STREET
USE!!-
NOTE: This step may require the assistance
of a professional transmission mechanic.
Loosen the rear servo band lock nut and back band anchor
the adjuster all the way out. Move the
rear band lock nut
extension housing back far enough to pull the
band anchor out (See Figure 13). When the adjuster
apply arm is loose the band strut will fall out apply arm
and the apply arm will be able to move out of
rear servo
the way to access the rear servo.
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18. FOR 3-SPEED OFF-ROAD RACING Fig. 14
band strut
APPLICATIONS ONLY
(Manual down shifts to low gear at any speed)
-!!NOT RECOMMENDED FOR STREET
USE!!-
Push down on the spring retainer and remove internal retaining ring
the internal retaining ring. Take the spring spring retainer
retainer, original servo spring, and piston
assembly out of the bore (See Figure 14).
retainer spring
piston
19. FOR 3-SPEED OFF-ROAD RACING Fig. 15
spring retainer
APPLICATIONS ONLY
(Manual down shifts to low gear at any speed)
-!!NOT RECOMMENDED FOR STREET
USE!!- original servo spring
external retaining
Push down on the rear servo piston assembly ring
and remove the external retaining ring (See rear servo
Figure 15). piston assembly
20. FOR 3-SPEED OFF-ROAD RACING Fig. 16 spring retainer
APPLICATIONS ONLY
(Manual down shifts to low gear at any speed)
-!!NOT RECOMMENDED FOR STREET
B&M rear servo B&M rear servo
USE!!- blocker spring
Install the supplied B&M rear servo blocker as
indicated in Figure 16. Reassemble the piston,
the original piston spring, and the supplied
external retaining ring (See Figure 16).
21. FOR 3-SPEED OFFROAD RACING APPLICATIONS ONLY - (Manual down shifts to low gear at
any speed) -!! NOT RECOMMENDED FOR STREET USE !!-
Reinstall the modified rear servo piston assembly, supplied B&M rear servo spring, spring retainer
and internal retaining ring back into the bore. Reassemble the band strut, band anchor, and extension
housing. Tighten the adjuster until it is snug and then back the adjuster off three (3) full turns. Secure
the adjuster with the rear band lock nut.
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22. (1966 thru 1969 transmissions only): Fig. 17
Loosen the front servo adjusting screw, band anchor,
and front and apply strut. Remove the front servo (See adjusting screw
Figure 17).
band anchor
front band apply strut
front servo
23. (1966 thru 1969 Fig. 18 66-69 Front Servo Assembly
transmissions only) B&M front servo
Install the supplied B&M front smaller
inner return spring
servo inner return spring if not center pin
already equipped (later model approx. 3/8”
transmissions do not require diameter
any front servo modification)
Later Model Front Servo Assembly (not
(See Figure 18). The later necessary to remove or disassemble)
model front servo piston has a
larger (over 1/2”) diameter larger
center pin
center pin and does not require
over 1/2"
any disassembly or diameter
modification.
24. Reassemble in reverse order as disassembled.
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front servo return spring
transmission pan gasket (904) blocker rod
transmission pan gasket (727)
steel orifice plug
transmission filter
external
retaining ring
71-78 governor plug rear servo blocker
62-70 governor plug
rear servo spring
pressure regulator
screen
drill guide
throttle pressure spring (red)
1/4" steel ball
3/16” (.188) drill
limit valve spring 5/32” (.156) drill
1/8” (.125) drill
#32 (.116) drill
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IMPORTANT: RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE
Technical Service
A highly trained technical service department is maintained by Hurst Performance to answer your
technical questions, provide additional product information and offer various recommendations.
Technical service calls, correspondence, and warranty questions should be directed to:
B&M Racing & Performance Products
(707) 544-4761
www.bmracing.com
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