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(http://bustekhub.com/index.php/2016/10/12/vapor-air-
door-motor-speed-adjustments/)
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Allison Gen 4 / 5 B400R / B500R Valve Body
Assemblies
Allison Gen 4 / 5 B400R / B500R Valve Body Assemblies
Allison Valve Bodies:
Allison valve bodies for Gen 4 / 5 are the same in layout, springs, solenoids and spool valves. But between
the B400R and B500R there are di erences between some springs and spool valves, but all solenoids are
the same.
For ordering parts for a transmission, use the transmission serial number to cross reference the correct
parts.
Allison Valve Body Layout:
(http://bustekhub.com/wp-
content/uploads/2017/03/B400R-Gen-4-5-Valve-Body.png)
(http://bustekhub.com/wp-
content/uploads/2017/03/B500R-Gen-4-5-Valve-Body.png)
Solenoid Valve Body Assembly:
(http://bustekhub.com/wp-
content/uploads/2017/03/Gen-4-5-Solenoid-Valve-Body-1.png)
(http://bustekhub.com/wp-
content/uploads/2017/03/Gen-4-5-Solenoid-Valve-Body-2.png)
(http://bustekhub.com/wp-
content/uploads/2017/03/Gen-4-5-Solenoid-Valve-Body-Assembly.png)
Main Valve Body Assembly:
(http://bustekhub.com/wp-
content/uploads/2017/03/Gen-4-5-Main-Valve-Body-Assembly-1.png)
(http://bustekhub.com/wp-
content/uploads/2017/03/Gen-4-5-Main-Valve-Body-Assembly-2.png)
(http://bustekhub.com/wp-
content/uploads/2017/03/Gen-4-5-Main-Valve-Body-Assembly.png)
Diagnostic Switch PS-1:
The diagnostic switch PS-1 has two functions:
1. When the C5 clutch is lled, It veri es pressure to the C3 clutch pack in reverse, neutral, and 1st
range are attained.
2. When the C5 clutch is exhausted, it veri es the positions of the C1 and C2 latch valves.
If incorrect pressure is sensed by the switch, the signal will be sensed by the TCM, and a DTC will be
logged.
(http://bustekhub.com/wp-
content/uploads/2017/03/Gen-4-5-PS-1-Switch.png)
Note: C1 and C2 latch valves control uid pressure between clutches. They also control limp mode
operation.
⇒ PCS-2: Controls the C2 clutch pack, but in reverse it will control the C3 clutch pack.
⇒ PCS-3: Controls the C3 clutch pack, but in neutral, reverse and 1st range it will control the C5
clutch pack. The C5 clutch pack has no assigned solenoid.
(http://bustekhub.com/wp-content/uploads/2016/10/Allison-Gen-4-5-
Solenoid-to-Clutch.png)
Allison Gen 4 / 5 Solenoid to Clutch Combination
Filter Life Switch PS-2:
The lter life switch PS-2 monitors lter life deterioration when the lters need replacing. When un ltered
main pressure (pressure on the outside of the lter) becomes greater than ltered lock up pressure
(pressure after the lter). The un ltered main pressure will increase and activate the PS-2 switch, sending
a signal to the TCM. This signal will activate the Prognostics service icon on the shifter that lter service is
needed.
(http://bustekhub.com/wp-
content/uploads/2017/03/Gen-4-5-Filter-Life-PS-2-Switch.png)
Retarder Valve Bodies:
The retarder is a bolt on hydraulic brake at the rear of the transmission to help slow the vehicle down.
The valve body receives activation commands from the TCM to apply the retarder. The PCS-5 solenoid is
PWM which controls retarder application. How much retarder application, depends on driver input
demand.
Note: All retarder valve mounting bolts to retarder housing are M8 bolts that are torqued at 18-21
lb. ft. (N m 24-29).
⇒ The metal separator plate between retarder valve body and retarder housing is coated with a
sealing agent. No paper gaskets are used.
(http://bustekhub.com/wp-
content/uploads/2017/03/Gen-4-5-B400R-Retarder.png)
(http://bustekhub.com/wp-
content/uploads/2017/03/Gen-4-5-B400R-Retarder-Gasket.png)
(http://bustekhub.com/wp-
content/uploads/2017/03/Gen-4-5-B500R-Retarder.png)
(http://bustekhub.com/wp-
content/uploads/2017/03/Gen-4-5-B500R-Retarder-Gasket.png)
Valve Body Torque Specs:
Internal valve body torque specs are as follows:
Note: Control valve body mounting bolts to transmission case and lter nuts are M10. Torque to
these bolts or nuts are 38-45 lb. ft. (51-61 N m).
http://bustekhub.com/index.php/2016/08/13/allison-transmission- lter-oil-change-b400r-b500r/
(http://bustekhub.com/index.php/2016/08/13/allison-transmission- lter-oil-change-b400r-b500r/)
(http://bustekhub.com/wp-
content/uploads/2017/03/B400R-Gen-4-5-Valve-Body-Torque.png)
(http://bustekhub.com/wp-
content/uploads/2017/03/B500R-Gen-4-5-Valve-Body-Torque.png)
Links:
http://bustekhub.com/index.php/2016/10/08/allison-wtec-iii-gen-4-5-hardware-di erences/
(http://bustekhub.com/index.php/2016/10/08/allison-wtec-iii-gen-4-5-hardware-di erences/)
http://bustekhub.com/index.php/2016/08/13/allison-transmission- lter-oil-change-b400r-b500r/
(http://bustekhub.com/index.php/2016/08/13/allison-transmission- lter-oil-change-b400r-b500r/)
http://bustekhub.com/index.php/2016/08/02/allison-transmission-shifter-functions-and-prognostics/
(http://bustekhub.com/index.php/2016/08/02/allison-transmission-shifter-functions-and-prognostics/)
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