OK, I have set up literally HUNDREDS of rears in my time as a mechanic. Some things to know....
First, if you are getting a kind of ringing/howling noise, it could be that the ring and pinion are worn out. Test for ring and pinion noise by driving. Noise will be more on either the coast or power side. If it is the same on either, it is probably NOT the ring and pinion. Also, ring and pinion noises generally come in at some speed, and as speed increases, they fade out.
Second, to replace pinion bearings, you only need to re-use the original shims. Pinion depth is set BEFORE bearings are installed, and is the relationship between the pinion gear and the housing. The depth measurement is taken with the bearing cup in place, and varies by as little as .001". New pinions are mark4ed with plus or minus numbers that indicate deviation from "nominal" pinion. Bearings come into play later. They are installed AFTER depth is measured and shims are selected. Therefore, the old shims will be fine.
Third, bearing preload. Once you have changed the bearings, preload is set by the crush sleeve. It should be MEASURED with a "sway bar" type torque wrench. You tighten until the correct drag is MEASURED.
Fourth. Carrier bearings and wheel bearings can also cause noises. Be sure that you are replacing the right bearings or you could end up spending a lot of money on parts without fixing the problem.
Lastly, Noise is NOT inherent in ALL rears as previously stated. That is the reason that these gear types are used. They run quietly!
If you have any other questions, feel free to email me.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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