They should all three (your original included) be the same, gear ratio notwithstanding. I'd measure the perch width on the tundra axle, since I've never matched one up in person, but everything I know about them says they're plug and pray. There's some piddly stuff different about the early Tundra axles, like the orientation of the hard brake line T fitting, but as long as you go with 4wd, like you mentioned, they'll both be sprung over and should bolt right up...again...gears...and little headaches like that brake fitting...notwithstanding.

~Adam


96 T100: D44, lockers and stuff