I am considering improving the highway revs on my 49 3/4. It currently has a 216 (Crazy Canadian Truck), a grany low 4 speed and a 4.57 rear. I want to change to a 4.10 rear (if I can find one) but I am also interested in the T5 5speed OD tranny. Will it bolt to the 216? which one would be the best all-round driver?

I'll have to change the drive shaft anyway, so would it be better to just change the short forward one to fully open and get a new bearing or could I get away with a longer large diameter one-piece drive shaft? Would I still have shaft balance and whipping problems with say a 3" or 3 1/2" shaft?

Thanks

Current fleet (subject to change w/o notice)
\'49 GMC 3/4-Ton , 60 Austin Healey Frog-eye Sprite (some assembly required), 2011 Dodge Avenger, 2015 Jeep Cherokee. No, they don't all run.
My other ride is a (B737)no, (B767)no, A320.... Update... was Embraer E190, now Boeing B787.

Knowledge is a wonderful thing, but ignorance means you don't know you can't do something.