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Diff pinion depth on a new(ish) JK

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Old 01-19-2016, 10:45 AM
  #11  
aro
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Originally Posted by scubatech
I used to do a fair amount of differentials and this is the first I have seen that were off like that. They have to be making noise? I think when they are assembled at the plant they have the exact housing specs and can install the right shim to do it quickly and keep the production line going. I'll bet someone changed the setting when installing the Ox Locker. Those gears will have a short life.
I am that someone who installed the Ox I haven't touched the pinion, and the carrier shims are the stock ones. There weren't making noise at all.

I'm actually inclined to believe that they would work... Look at the drive pattern (1st photo). It's not perfect, but it's not a bad shape, a little closer to the toe, which is good. It seems to cut off at the top, but it doesn't really. It actually fades close to the top. It could be a little more towards the root, but as long as it doesn't cut off at the top, it should be fine.

The coast pattern I don't like, but then it's used only in reverse.

Last edited by aro; 01-19-2016 at 10:50 AM.
Old 01-19-2016, 11:12 AM
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Am I the only one who can't open the photos? I can only see the small photo which doesn't help much.

Words of wisdom when looking at patterns (especially used gears): Being centered heal and toe is not a major concern, just make sure that it is well centered face and flank.
Old 01-19-2016, 11:23 AM
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I tried the photos in several browsers and they opened up fine. Here is two links to them:

http://i1190.photobucket.com/albums/...psxvzc8tlh.jpg


http://i1190.photobucket.com/albums/...pssibqbtsy.jpg
Old 01-19-2016, 11:45 AM
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There are several variations of patterns that are acceptable. Not just the classic nice and centered on the drive and coast side perfect patterns. On those pics you would expect your coast side pattern to be closer to the heel with the drive side showing closer to the toe like that but its not. It does appear to be a little high on the coast side though. Not all gear sets will setup with perfect patterns, this is why there are acceptable variations. This is where experience comes in. If it is not making any noise and the lash is set correctly I would run it. Just changing the carrier should not have affected the pattern besides having to check and possibly readjust the lash.
Old 01-19-2016, 11:50 AM
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Originally Posted by ShutterBug
Doh!



I get that part, I guess I'm trying to figure out (for my own edumication) how to determine if it's pinion depth or carrier placement that would correct a specific contact pattern, etc. I guess that's why guys go to mechanic's school.

If I had a bigger shop, a heated garage, and some spare pinion bearings to play with, I might consider tackling it myself, if I knew what to do to correct the patterns I am seeing.
I already told you how to fix your issue. If you were any closer I could whip that up in 30 minutes with the axle already out of the vehicle like it is.
Old 01-19-2016, 12:01 PM
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Originally Posted by DKJEEP
There are several variations of patterns that are acceptable. Not just the classic nice and centered on the drive and coast side perfect patterns. On those pics you would expect your coast side pattern to be closer to the heel with the drive side showing closer to the toe like that but its not. It does appear to be a little high on the coast side though. Not all gear sets will setup with perfect patterns, this is why there are acceptable variations. This is where experience comes in. If it is not making any noise and the lash is set correctly I would run it. Just changing the carrier should not have affected the pattern besides having to check and possibly readjust the lash.
I agree, experience comes in handy, especially since my pattern is not quite your run of the mill pattern. I think I literally looked at every pattern that Google can find, and while a few are maybe somewhat close, I couldn't find anything quite like it.

Usually, incorrect pinion depth shows up at opposite sides/corners. In my pattern, both drive and coast are on the same side, closer to the toe. Just that coast is higher than drive. It could well be the way they were machined, and maybe that's why factory left them like that. Some R&P's can be a pain if you chase a perfect pattern.
Old 01-19-2016, 01:53 PM
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Originally Posted by aro
I agree, experience comes in handy, especially since my pattern is not quite your run of the mill pattern. I think I literally looked at every pattern that Google can find, and while a few are maybe somewhat close, I couldn't find anything quite like it.

Usually, incorrect pinion depth shows up at opposite sides/corners. In my pattern, both drive and coast are on the same side, closer to the toe. Just that coast is higher than drive. It could well be the way they were machined, and maybe that's why factory left them like that. Some R&P's can be a pain if you chase a perfect pattern.
I was a little surprised to see both at the toe. But since you know the differential and the gears are quiet, good lash why not. Patterns always look better in person.
Old 01-19-2016, 02:00 PM
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There's really no guarantee with that somewhat unusual pattern... I might regear before anything happens.
Old 01-19-2016, 03:19 PM
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Originally Posted by DKJEEP
There are several variations of patterns that are acceptable. Not just the classic nice and centered on the drive and coast side perfect patterns. On those pics you would expect your coast side pattern to be closer to the heel with the drive side showing closer to the toe like that but its not. It does appear to be a little high on the coast side though. Not all gear sets will setup with perfect patterns, this is why there are acceptable variations. This is where experience comes in. If it is not making any noise and the lash is set correctly I would run it. Just changing the carrier should not have affected the pattern besides having to check and possibly readjust the lash.
X2

Both being on the toe like that usually means add a little backlash in my experience, but you said you are already on the loose side. I'd run them like that and both think twice.
Old 01-19-2016, 03:23 PM
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Here is another pretty lousy factory pattern from this forum: https://www.jk-forum.com/forums/modi...attern-266900/


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