Allison 5sp: Horrible noise coming from the transmission

[juddski88]

Im going to put my valve body from my transmission into the transmission that is in my truck now. Is there a trick to taking out the shifting linkage the the nsbu is hooked to?

kind of just drop it slowly and at a slight angle away from the linkage, keeping an eye on the pin so not to drop it and lose it.

 

[Motomike119]

What is the torque spec on the valve body bolts?

 

[Evan@InglewoodTrans]

What is the torque spec on the valve body bolts?

9 ft-lbs put the valve body on with the bolts loose and work from the center out.

 

[Mike L.]

Leave the valve body bolts snug ( finger tight ) and mount on the trans case. Then torque all the bolts to 96 in lb. There will be less of a chance of the valve body to distort as it will be supported on the case.

 

[Motomike119]

Valve body did the trick. I need to have the codes cleared and see if they come back. Drove the truck for awhile and everything worked as it should. Big thanks to this site and the guys that helped me out!! Another successful ending! :woott::thumb:

 

[kurtibm]

Hi All-
I have a noise in my 2001 Allison - sounds a lot like a rear end noise (sort of a howling) but it seems to be in the transmission gear train. 250K miles.
Anyway, the noise is more pronounced in low gear and it is louder/more prevalent on deceleration - whereas at a steady speed it almost disappears. 2WD, 4WD, 4WD L - no change. Any Allison trans guys have a hypothesis, please? Rear planetary maybe?
BTW - No codes.

Many thanks!

Kurt

 

[BowtieClub]

Bump, but you might want to call Mike if he doesn't read this.

 

[rgullett83]

Is it evident in certain gear ranges?

 

[IOWA LLY]

Sounds like you lost a torrington bearing. Pull the pan and look for metal debris. If you find excessive metal debris your going to have to pull the transmission and completely disassemble it to finish diagnosing it.

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