right, i need to know, will 4wd sierra gear fit into a 2wd tunnel?!

im edging my bets it wont because of transfer box etc etc, but i want to be 100% sure.

can anyone gimmi any solid info on what id need to do to get 4wd sierra gear into a 2wd tunnel (the front end isnt a problem, its the tranny tunnel)

cheers in advance peeps!