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They got a bad name because they were put into trucks that were too heavy and driver abuse or ignorance put an early end to them. I had one in a 77 six wheeler it ran great never had a problem with it but I took the time to educate myself on the dos and donts when operating them.

The trans is a brand new 6453 it is for the 809 series trucks it was new in the can when I bought it. I used it because the turbocharged cat puts out 250 HP I didnt think the deuce trans would hold together. Theres a build thread on it here somewhere putting a 3208 in a bobbed deuce.

When I put the spicer 6453 in my bobbed deuce I made an adapter plate that bolted a jack shaft from a five ton truck to the stock deuce transfer case. The five ton jackshaft is shorter than the stock deuce jackshaft so I didnt end up moving the transfer case back the automatic was 32 inches long...

Length might be a problem I put a trans from a five ton in my bobbed deuce and the trans from the deuce was considerably shorter than the five ton manual. But I believe the allison being a bit longer than a stock deuce trans might work in your favor.