Presumably we're talking about a StoveBolt engine and Torque Tube tranny here ? .
To disconnect the driveshaft , loosen the threaded collar at the back of the ball housing (usualy under 3/4" of nasty , gooey gunk crap) then remove the four bolts holding the ring onto the back of the tranny , clean the gooey crap off the driveshaft with a scraper or putty knife and slide the ball back , oil _will_ pour out onto your catch towel , look at the U-joint , the caps have two small bolts each , unscrew these and the yoke with U-joint will slide back far enough to clear that back of the tranny .
I like to use a water pump bolt on the front of the engine and a manifold bolt at the back , this way the load is more or less balanced so it's easier to remove . taking out the radiator and upper baffle prevents you from ruining these expen$ive to replace items you'll be needing later after the V-ate is in .
I hope this helps ? .
BTW : please save all the U-joint & ball parts , folks need them , even the hardware and lock washers etc.