In the XX4 you can use either A3099 or A3098 thrust races, if you fit the XXXcr one (A3018) the diff screw won't quite be long enough, and the drive shaft will bottom out on the top of the diff screw.
Also if you use the XXXcr monster diff screw and spring in the XX4 diff, you'll find it hard to get the proper adjustment, thats why I still use the beveled washers in mine. You just need to replace them every once in a while, as they lose the spring tension.
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