1040429
The best way is forget about your current transmission. Start with a good combination. If you like the 350 go for it also find a 700R4 transmission or a turbo 400 both are automatic and can handle a 350 your transmission wouldn't make it to long. Try to find a match that is in a 4wd truck already that way you don't need to change the tail shaft of the transmission, and only need an adapter to the transfer case. Then you will need to modify your drive shafts to make it all work together. You can call me with any other questions if you would like @ 315-697-6211 mon-fri 9-6 est.
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