Need advice on what year trannys/transfer cases will swap....

[GiMiCs]

Hi all, I have a '71 GMC 1500 2WD w./ a 350c.i./TH-350 and have found more '73 and up trucks w./standard trannys and transfer cases than the '67 to '72 ones, and a heck of alot cheaper too!-LOL!

My question is; Is it possible to easily swap a standard tranny out of one from a '73 and up one into my auto. P/U ? I've heard they 're a different frame, but since Chevy/GMC used the same motor mounts up thru the late '80's (for SB's anyway), I thought maybe the trannys/transfer cases might easily swap over too? Or would I need adapters, fabricated mounts, -etc;?--- THANKS for ANY/ALL HELP you can send my way!!

Also, On '70's thru '80's bellhousings...Will a 250 L-6, 292, bell housing on a standard or auto. tranny take either a SB or BB Chevy motor. Again, MANY Thanks as I am clueless, but energetic!!!