Advanced Adapters used to sell a kit to swap a Muncie car 4 speed into a GM 4x4,I was very tempted to put one in my 72 K5 I had back in the 90's..I have read about GM using a close ratio NP435 tranny in some 4WD trucks,and a Clark 5 speed in 60's trucks,but I've yet to see one in person...
The statement about the bellhousings is correct,so you'll need a car bellhousing or blowsheild to put in a 4 speed car trans...A Borg Warner T-10 would be a decent tranny,and might be available cheaper than a Muncie--the Saginaw 4 speeds weren't all that bad either really..I had a friend who owned a 1982 C-10 with a 250 six that used to be a telephone Co. fleet truck,it came factory with a 5 speed tranny that was the same one Chevy used in the Monza's!..light duty at beast,it had the shifter integrated with the tail shaft..but that truck would get 22 mpg on the highway and the tranny had good "spacing" between the gears--no winding out,then bogging,like the SM465's...I know another guy who put a 4 speed top loader from a 70's mustang in his 70's GMC 2wd truck--beleive it or not GM and Ford used the same trannies some years,both 3 and 4 speeds,and they were practically a bolt in swap...
