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I would build the 73 3/4 ton( if the frame is in good shape). put the 91 front clip on it. Find a D44/14 bolt and a 205 TC. You can use the 91 diffs but I'm not crazy about the 10/12 bolt that I'm guessing is in the 91.(assuming you want to wheel the thing)Sell all the unused parts to help finance the build, and whatever don't sell wait a couple of months for the price of scrap to go up and get rid of the rest. Around here scrap is $130 a ton for cars/trucks.6 months ago it was $250. Now there is a limit on tire size using a D44 I would stay around 36's you can go bigger you just have to watch how hard you wheel it. If you have a good cash flow get a D60 Front diff. My .02Steve