welcome to the 'bolt Bob! we always like to see more of the 5-9 trucks here
if it's basicly the same rear as the Chev [should be] there's 3.38 gears made - Patricks [near you] will have'em or a good rear-end shop - spendy tho, prolly a grand all in - should be an OD trans that would pretty much bolt in -I can't name it, but someone here will know
Bill