I'm no help with that fitment. But I've had one in my GMC Dually (4.10 gears) since 1996 and it's the best modification on the truck.
Utterly bulletproof, needs only an occasional fluid change.
Fortunately there was a place on the dash for the rocker switches, so it even looks factory-installed.
It did require some fiddling with driveshaft angles.