12 valve and electronic Allison (B400) mating?? - Competition Diesel.Com

Craig_C · 02-02-2016, 07:18 AM

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 · 02-02-2016, 08:12 AM

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 · 02-02-2016, 09:11 AM

Quote:

Originally Posted by 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.

Awesome. Can I text you? Be a lot easier

jchilgy44 · 02-02-2016, 11:16 AM

Sent you a PM

02-02-2016, 07:18 AM	#1
Craig_C Name: Craig_C Title: Resident Smartass Status: Not Here Join Date: Apr 2010 Location: Corydon, IN Member`s Gallery Posts: 1,714	12 valve and electronic Allison (B400) mating?? 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?

02-02-2016, 08:12 AM	#2
jchilgy44 Name: jchilgy44 Title: Pro pit vehicle operator Status: Not Here Join Date: Sep 2010 Location: Beer city, USA aka grand rapids MI Member`s Gallery Posts: 90	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. __________________ Flushing money down the toilet one truck pull at a time.

02-02-2016, 11:16 AM	#4
jchilgy44 Name: jchilgy44 Title: Pro pit vehicle operator Status: Not Here Join Date: Sep 2010 Location: Beer city, USA aka grand rapids MI Member`s Gallery Posts: 90	Sent you a PM __________________ Flushing money down the toilet one truck pull at a time.