Thanks for the replies, FredT and Oldsub. Thats the main thing that scares me is the torque tube issues. The easiest thing that I could think of to do is find a way to convert the 1/2 ton differential to accept an exposed drive shaft or do a substitution as you suggested. The 3/4 tons have a torque tube halfway back to the rear and they convert to an exposed (open) shaft to the differential. You are correct that the 3/4 tons are 18 plus inches longer, but I think that the open drive shaft makes some swaps easier. I know that there are u-joints that convert the 48 to more modern diffs. I will keep driving until think this out some more. I would not like to get too radical. I like the stock look and would not like axles that are too wide. Thanks for your ideas and I look forward hearing more.
Ralph


rtlopez@shipleysystems.com
48 Chevy 3600 w/235
48 Chevy 3100 w/235:
You cant see the smoke on a dirt road.