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Unread 04-22-2013, 01:25 PM   #1
Alaska-HWY JK
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Failed Superior 5:13 ring gear.

The axles with these Superior gears were installed in late May 2010 and failed in late Sept 2012. A ticking was noticed when I put the hard doors and hard top back on and upon inspection the rear ring gear was found to be damaged. When pulled apart to install new Yukon gears the pinion was found to have no preload and the diff bearings were worn. The diff fluid was clean except for ring gear schrapnel.The Jeep had around 50,000 km on the axles. I use this Jeep offroad but am in no way abusive to it. It is a daily driver so most of these km's are on the road. I have 35 spline Superior axles, ARB locker and 37" old school GY MTRs also if that helps. Had it rebuilt in March.

Any opinions on this failure?

Please don't respond with " That sucks" we all know it does.
Thanks.

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Unread 04-22-2013, 01:32 PM   #2
222Doc
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looks like the pattern is to much to the rear of ring.
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Unread 04-22-2013, 02:24 PM   #3
toxicwaste29
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Dont they have a lifetime warranty. Just take it back
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Unread 04-22-2013, 02:33 PM   #4
SubAtomicGenius
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I concur with 222Doc. Break pattern follows the load progression of the pinion gear along the drive side of the ring gear in one sweep. I'd say a chunk broke off from the outer portion of the tooth and an increased load was applied to each progressive tooth and broke the remainder in the sweep. Your pattern does seem to be on the outer diameter of the tooth face, which indicates to me that the pinion depth was too far away from the ring gear (notice no wear/pattern on the inner diameter). Pinion depth should have been increased with shims to move pattern to the center of the ring gear tooth face (of course with proper corresponding backlash set between 6-10 thou).

If your pinion had no preload (!yikes!), perhaps - in combination with improper pinion depth - the ring gear forced the pinion outward under load (towards your driveshaft) and, hence, the pattern/increased force along the outside of your ring gear. Too much force, with a bit of pinion deflection (due to pinion bearings not being preloaded/seated in races) inevitably busted off a tooth/high spot before the set could wear in...

That's my $0.02.
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Unread 04-22-2013, 02:37 PM   #5
jwmbishop
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Quote:
Originally Posted by 222Doc View Post
looks like the pattern is to much to the rear of ring.
Quote:
Originally Posted by SubAtomicGenius View Post
I concur with 222Doc. Break pattern follows the load progression of the pinion gear along the drive side of the ring gear in one sweep. I'd say a chunk broke off from the outer portion of the tooth and an increased load was applied to each progressive tooth and broke the remainder in the sweep. Your pattern seems to be on the outer diameter of the tooth face, which indicates to me that the pinion depth was too far away from the ring gear perhaps (notice no wear/pattern on the inner diameter). Pinion depth should have been increased to move pattern to the center of the ring gear tooth face (of course with proper backlash between 6-10 thou). That's my $0.02.

Yep. Not sure if lifetime warranty covers improper lashing... I know most companies do NOT... and specifically state so.
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Unread 04-22-2013, 02:41 PM   #6
SubAtomicGenius
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Was the axle assembly set up in a shop or a home-brew job? That is the question!
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Unread 04-22-2013, 02:44 PM   #7
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Maybe the pattern was too high, too - I can't see a non-contact portion on the tooth crest on the drive side either. Hard to tell without marking compound. If so , that's backlash. All moot point if the pinion preload wasn't set, anyhow...
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Unread 04-22-2013, 02:49 PM   #8
222Doc
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remors have it that Superior is out of biz. Though this has nothing to do with that.

Looks like and I have bad eyes anyway that the patter even runs off the outer edge.
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Unread 04-22-2013, 03:08 PM   #9
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1 - not enough contact all the way to the heel. You can clearly see the cold spot on the inner edge of the tooth face. Alternately you can see brinelling on the backs (180 degrees over from point 1)

2. The outer edge failed and debris came across the other three teeth. Note the difference in look of damage. At the outer edge its a clean shear - the next three teeth as the debris came inward there is "run-over" damage.

Improper lash.
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Unread 04-22-2013, 03:47 PM   #10
Alaska-HWY JK
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Here's another one. I can't get more than one to post at a time.
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Unread 04-22-2013, 03:50 PM   #11
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And another.
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Unread 04-22-2013, 04:17 PM   #12
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Link
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Unread 04-23-2013, 11:23 AM   #13
Alaska-HWY JK
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Thanks jwmbishop, good info on that link.
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