T-56 for 4WD or am i dreaming??

[mickman77]

Hey all, new here and have a question. My '77 K-20 project is under way. Yanked the 400 sbc and dropped in a 454 for some muscle. would love to figure out a way to mate a T-56 6 speed and an NP205. Is this a possibility or am i just hoping for some dilusional (and crazy expensive) fantasy?
At the moment the original th350 and np203 are still in the truck. Rolling down the interstate here in montana on 33's with 4.10 gearing has the mighty motor spinning faster than i care for. Have entertained the idea of putting either 3.73's or 3.56 in the axles but i think a beefier tranny should be the first order of business. whadya think?? any advice would be greatly appreciated.