Is there a difference between the allison behind an 01 seirra 2500hd with an 8.1 vs a 02 sierra 2500hd with the duramax. (long story short im trying to find a core and i may have found one.)
Why would you do that when they are the same?I have a 8.1 and a Duramax and the transmission does feel different but that could be more due to the engine than the trans. If you have a decent dealer close to you you could have the parts guy run part numbers and do a comparison.
The converter is different and the TCM strategy is different. The Allison is the same. If you don't believe this than go see your GM parts man.Just a suggestion in case the tc or any thing else is different. If they are identical then great. Half into a project and realize there are settle differences really sucks.
yes, the TCM's are the same. It just has a different operating system/calibration loaded into it.No reason to doubt it. Thanks for the good info. Can the tcm from a 8.1 be used for a duramax and just get reprogrammed? Just trying to learn more info on these trucks thanks again
What year is your Dmax?Ok i'm looking at a 03 allison off of a 8.1. Everyone is always talking about reflashing the tcm but why cant i just take the trans put it in and hook to my old dmax ecm. Is there anything other than sensors and actuators in the trans? and are they any different than the ones in a dmax?