May I ask why you guys are using an allison instead of something that doesnt defuel? Also why not use a lighter 9" rear?
Considering building Allisons is our bread and butter using anything but an Allison wouldn't make much sense for us. It will give us a opportunity to test our new parts and ideas at the highest levels. It's never going to be a full blown race trans but we don't have an issue getting them to shift how we want and hold as long as we want when everything on the truck is happy. This truck is for us to learn from. If I wanted to squeak everything out of it there would be a TH400 and few other changes but using parts combinations customers don't have we don't learn anything beneficial.