Canada had 5 some speeds. My son Austin has ran one since '05 and one finally blew up in 2012 . They are indestructable except they have the same pinion bearing . When they get loose or sloppy , there goes your r and p. (Keep your diff bearings adjusted periodicly and maybe he could have went longer). You'll have to run a 1/8" or 3/16" plate encompassing the frame horn giant bolts and between the bell housing and trans. NO thicker because thicker takes away the hiegth of your 2 big dowel pegs coming out of the case. Compared to a 538 4 speed, it will extend your motor back 2 1/4" so watch out for your exhaust hitting your cage. His 486 5 sp. final gearing, comparing to a 4 speed, is 529. His old broken 483 was like a 526:1 (in 1st gear). The 5 speed is ideal for strength and turning 38"' Boggers. I named 2 dogs once, Bogger and Swamper . lol Or you can simplify and save many $1ks and simply go fwd longways.
I believe I was the 1st in my state to have a 542(1994), a side shift(2000), and a 5 speed (2005) , so y'all listen to me.