Now that I think about it some more you might have a pretty late model (01-07?) GM only ZF 6 speed as used in medium duty trucks.
I think the similar ZF 6 speed used in the GM pickups had integral bellhousing and the medium duty transmission was without bellhousing.
If it is, and before you do away with the transmission, I'd be interested.
Grigg
From his description of the shift pattern it isn't a ZF-6 used in GM trucks. Ford put basically the same tranny in the Diesel Superduty trucks from 99 thru about 07 (maybe later). I have one of those and the shift pattern (going top to bottom and left to right) is R,L,1,2,3,4,OD, with OD hanging out to the right and away. I believe the GM equivalent used the same shift pattern. They also split vertically with a very short main section and front and rear covers bolting to it. The housing is aluminum.
