OK --- the 350 Chevy is out of the way. I just hope the hole that's left is big enough for the Cummins. Gonna' be tight, especially with the Allison six speed hanging off the back. BTW...I gave up on finding a used one and called Stewart & Stevenson to price a new one from the factory built to my specs. Guess what...the new one should actually be cheaper in the long run. By the time I bought a used (unknown) unit, had it gone through and set up to work with my two-wire motor, it would very likely have been at least a grand more! And the brand new unit will come fully tweaked from the factory set up exactly for my rig. S & S uses a computer modeling system called "iSCAAN" that analyzes tons of input (weight, drag coefficient, gearing, tire size, various road surfaces & on & on) then spits out a 17 page print out that predicts performance across the board. Even the fluid temperature at various RPM's in different gears. Best part is that my original personal calcs had indicated a need for something around 4.11 gears in the rear. Turns out my stock 5.43 gearing is perfect with the double overdrive so I won't have the ha$$le of swapping the whole rearend! Outstanding!
It will take a month to build but I still have a lot to do before I drop it in. Will get a few updated pix tomorrow.
Oh yeah...and if anyone is looking for a nice, tight original 4-speed tranny, I will be putting a note about it over in the classifieds shortly.