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We decided that a 4.10 gear would be just about right with our 27-inch-tall tire and four-speed. We then pressed the inner pinion bearing in place so we could begin our task of measuring for clearances. Until you have the proper pinion depth achieved, you will not place the compression bushing on the pinion gear. This gets done during final assembly. If you use the 742 case, there is no compression spacer.