Pinion depth is controlled by the rear bearing spacing....the more shims that go between the pinion head and the bearing, the deeper the head goes into the ring gear. The shims that you use on the end of the spacer controls the amount of preload on the bearings and has no effect on pinion dept. With depth mics, you can check pinion depth but you need to make sure the bearing bores are the same in the saddles and the bearing caps. If they are different, you'll need to calculate the difference in order to adjust for it being off center. They are not always machined on perfect center and measuring that isn't real easy using the flat point of the depth mic spindle but you can get it if you measure the cap and saddle exactly in the center. If the depth mic has a rounded spindle end, then it's even better and easier. Did you get the old bearing off of the old pinion? If so and it's still in good shape, you can hone the bore on that and use it as your checking bearing. We called them 'dummy' bearings at work....but not because anyone was a dummy out there lol. If you do that, go ahead and install the new cup into the case. An old bearing in good shape will only be a few thousanths of an inch different than a new bearing and their tolerance is on the money. Bearings are made with a very close tolerance....especially non China made bearings. They are supposed to be but it's no telling what you will get with those. One more note, you can also place shims under the cup if you can find them. Done them that way before too and yes, I have a couple of dummy cups laying around lol
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Last edited by Cranky; 03-02-2010 at 12:40 AM.
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