the quaife just took a big jump in price. I think its $800 for the unit alone iirc. The 3rd gear syncro is pretty prone to going in the 98-00 mtx-75s since the dual blocker was down graded to a single blocker. As long as you replace the stock diff, your pretty much good to go as long as your syncros dont take a crap.
btw, mtx-75 questions belong in the transaxle branch.