Oh, another qestion and also some fairly exciting info I have found so far. First off... question... Is the rear output a slip yoke or not? One of the first pages I have found shows MOST of the TOD units to be 27 spline input and output AND a few of the K1500 series trucks show...

K Series 1500
(electric shift) 27 spline front input, rear slip output three wire indicator fixed front output yoke 4L60E Trans.
and

Trooper

behind 4L30E only (electric or vacuum shift) 27 spline front input shaft
Not sure if that means anything for sure, but its a step in the right direction. There were a few that said something about a 32 spline input but those were all with a different transmission (4L80E or other).

OK, back to research... I'll be back to jot down more notes. TTFN!

Coach!