Regearing... Is this pattern good?

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MikePL

MikePL

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This is the rear diff. We are getting the following ring gear pattern.
Of course the pattern doesn't look like anything we have in the drawings, hahaa.
Backlash within spec, pinion preload within spec.

1. Do we leave as is?
2. Do we remove a shim from under the pinion?
3. Do we separate the ring from the pinion? But what about backlash?

In our drawings the ideal pattern would be from around 25% of the tooth up, right in the center and rounded. Ours is also around 25% of the ring tooth and up but is more flat than rounded. Still good or no?

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I sent mine out and had the new gears and an ARB air locker installed by Marlin Crawler and this is what mine looked like. Hope this helps.

IMG_3220.webp
 
Is the gearset new or used? It matters which.
 
A new bevel gearset should be centered, both ways, and slightly towards the toe; never biased towards the heel. The distance between the face and root should be equal, to your eye. There is no need to measure anything related to the pattern.

A used gearset cannot be setup this way, due to the wear that exists. It's always safer to set up a used gearset biased towards the heel. Once it's loaded, it'll settle into a midline pattern.

These are subjective measurements, though, and the pinion depth must be set first, and absolutely must be correct. IME, people who don't build gearsets all day fret far too much over backlash measurements, because they have a dial indicator and can futz with it. They can't directly see pinion depth, and so they ignore it. Backlash is irrelevant, if you haven't set the pinion properly.

This is from my personal experience building large offroad drive and drive–steer axles. The number one root cause of build failure on the assembly lines I ran was due to pinion depth mismatch. The second most common, although very small in number, was due to case machining. That'll tell you how important getting the pinion right is to success.
 
MikePL said:
This is the rear diff. We are getting the following ring gear pattern.
Of course the pattern doesn't look like anything we have in the drawings, hahaa.
Backlash within spec, pinion preload within spec.

1. Do we leave as is?
2. Do we remove a shim from under the pinion?
3. Do we separate the ring from the pinion? But what about backlash?

In our drawings the ideal pattern would be from around 25% of the tooth up, right in the center and rounded. Ours is also around 25% of the ring tooth and up but is more flat than rounded. Still good or no?

View attachment 4104137

View attachment 4104138
Click to expand...
This is far too deep. Look at post #3. This is a textbook correct setup.
 
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