Looks to me like the front/smaller notched adjustment sleeve "B" sets the bearing "preload" and the larger adjustment sleeve "C" sets "pinion depth".
Before you removed the yoke, was there any play in the bearings or could you feel a "pre-load"?
If you have to remove threaded sleeve "B" to access the seal, when putting it back you just need to get it back where the "feel" of the bearings is the same as it was, or slightly more "snug".
If you have ever "set up" axle bearings before, this will make more sense to you.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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