front pinion seal leak - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 6 Old 03-22-2017, 08:00 AM Thread Starter
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front pinion seal leak

I recently had a set f 4:56 gears installed on my 13 Sahara JKU. I have a 2.5 inch suspension lift in the Jeep.When the Jeep first came back after the gear install, there was a vibration in the front end that we determined was caused by the front driveshaft (removed shaft, vibe gone). I sent it out to be rebalanced and it is now smooth. The pinion seal was leaking so we thought it was from the poorly balanced shaft so we replaced it the pinion seal. Now the new pinion seal is leaking again, but this time it only leaks at higher speed 55+mph.. Any thoughts? I checked the breather tube - it is not kinked or plugged. My gear guy has done may gear swaps and says they are set up perfectly. We just can't figure out why the pinion seal is still leaking. Any thoughts? I am tempted to buy a new Adams front driveshaft and see if a double cardigan helps. My other thought is to set up the Go-Pro camera underneath the Jeep and keep the lens pointed at the d-shaft/pinion area to see if we can visually catch something going on. Anyone else have this problem after a gear swap?
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post #2 of 6 Old 03-22-2017, 08:10 AM
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SOME*** aftermarket seals do not include a ring of sealant around the OD of the seal. I put a small bead of gasket maker around the OD of the seal either way before I pound it in there. This "could" be your issue that the seal is leaking from where it seals on the housing and not the pinion. I have also had that little spring retainer that pulls the seal tight around the pinion come off and it caused one to leak.

The orange bead on the OD is what I am talking about. Its not there on all seals.

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post #3 of 6 Old 03-22-2017, 09:43 AM Thread Starter
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I'm pretty sure he added a bead of sealer around it when he did it the 2nd time.
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post #4 of 6 Old 03-30-2017, 02:14 PM
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Was there a aftermarket front pinion Yoke installed to accommodate say a 1310 style ujoint end? If so its poss that the yoke is not the correct OD for the seal ID.
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post #5 of 6 Old 03-30-2017, 06:48 PM
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Did you seal the splines?

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post #6 of 6 Old 03-31-2017, 01:29 PM
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Your pinion may have never had its preload set right. This would cause it to vibrate and leak. Removing the drive shaft would stop it because there would be no load and no vibration. If you didn't hit your driveshaft I doubt it would go out of balance unless the u joints are worn or balance weights got thrown. Being that fixing the drive shaft didn't fix it. My guess is the shop botched the crush sleeve setting the preload. Set it to high and backed the nut off and reset it. But once the crush sleeve has been over crushed it is garbage and must be replaced. I'd bring it back to the shop that did the gearing and have them redo the crush sleeve.
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