I went to the junkyard again today. I couldn't resist! The bad news is that the GM trans with the R10 was locked up. I couldn't get anything to turn. Front shaft, rear shaft, shift levers, the Overdrive/frewheel lever did move though. I guess that happens when things are left out in the elements. The other transmissions were T86's and not T85's like I initially thought. They had R10F1-C overdrives and R10F1-A overdrives. Are the bearings and Planetary interchangable between the units? Could I possibly rebuild the GM unit with parts from the others?