Since I mentioned hypoid offset ring/pinion gears and bevel gears, it just seems fitting to note that i recently had fun removing/repairing/reinstalling such a couple of sets in the rear axle of our Rodeo. Good times, man.
Believe it or not, I put the chunk back in, and the gears don't grind! I'm so glad I didn't hafta shim the unit again... would've had to pop the carrier bearings off, gotten a tube of marking compound, would have taken all day in the cold rain. Such a relief!