Driveshaft length

I'm gonna say about 48.5". That's using some reverse math to get there.

http://board.moparts.org/ubbthreads/upload2/4563759-PartNoDriveshafts.pdf

47.99 is a for a 727 8.75 combo and the 8.25 has a little more space about .66".

Best to measure your set up to make sure. There's some wiggle room, but you don't want to get too far out.