Got my Keisler estimate

I see the GV guys every year at SEMA. They do have a quality product, and are happy to help.

Sounds like you are not married to either standard or auto transmissions, but limited by cost.

Since you are locked into the 4.10's, an OD is probably the best bet. I know they make a unit for a 727 that will hang in there @ 25,500 lbs GVW behind a 440 with a turbocharger - we used to really beat that rig running back & forth to Glamis.

I would rather have a 727 than a trans-mex (tremec) anything...

B.