Originally Posted by Caddyshack

The opplinger box is longer using a spacer for more room for bigger gears and added strength, the bara box using a gear kit is a little cheaper but it is semi helical so more noisey.

You need to make sure that on the supra diff you find a 3.9 ratio to match the 4x4 system front diff therefore not just any supra diff...you actually need a non turbo LSD 3.9 ration from around 1992. Therefore if you can suggest which Lexus to match that would be useful. Bara revuolt mine with new seals and bearings plus reset the diff LSD then repainted, it cost about £700 on top of buying a diff and then around £500 for the mk kit so it is around 1500 but they are bullet proof and can easily take 600-700 bhp with abusive driving.