12 valve and electronic Allison (B400) mating??

[Craig_C]

Curious if anyone here is knowledgeable in Allison transmissions, and what they require from the engine side of things. I have an old Uhaul that I am putting a 12 valve in, and have a B400 Allison, and all the wiring, tcm, shifter....basically the whole vehicle. The Allison was behind a 24 valve, and I really would like to run the 12 valve for the reliability standpoint.

So before I type a bunch of stuff up on this, does anyone think they can help any?

 

[jchilgy44]

The Allison TCM is going to be looking for a TPS signal. Without that it may have some serious up and down shifts as it will default to 100% throttle all the time. Do you know what generation your TCM/transmission is? Is it a single 80 way connector? or does it have 3 plugs going to it? If you can take a picture of the steel tag on the transmission on any info on the TCM I could probably get you heading in right direction.

 

[Craig_C]

The Allison TCM is going to be looking for a TPS signal. Without that it may have some serious up and down shifts as it will default to 100% throttle all the time. Do you know what generation your TCM/transmission is? Is it a single 80 way connector? or does it have 3 plugs going to it? If you can take a picture of the steel tag on the transmission on any info on the TCM I could probably get you heading in right direction.

Awesome. Can I text you? Be a lot easier

 

[jchilgy44]

Sent you a PM