Pinion Seals

Both?

That normally comes along with some bad u-joints or a bent driveshaft causing vibration and yes, I see it lots.

Mike

86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's

Joe Carroll wrote:

Yes 35c. That said I had the output shaft replaced orginally because of vibration problems along with different drive shaft and new u-joints. 12 months into new output shaft noise is back but no noticeable vibration. Thought it was tire noise. checked underneath and noticed both seals leaking bad.

yes , at the tranny and the rear-axle

Got it. But there is only one Pinion and it lives in the diff, the tcase seal is not a pinion seal. That's what confused me.

Got it, thought they were both pinion seals. What is tcase seal called?

A tcase seal...

I would be wondering about driveline angles then. Did you replace the bearings with the output? Same for pinion bearings. The last bout of vibrations would have damaged the bearings to a point and sloppy bearings will cause a leak again.

Mike

86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's

Joe Carroll wrote:

The tcase seal was replaced but I don't know about pinion seal. That said, this is a stock TJ, has not been raised. It's my daily driver, not a stump jumper. I never could figure out how it got a bent output shaft the first time. Could there be something causing that problem to return? Joe Carroll

2K-TJ

There are some simple truths...And the dogs know what they are." Joseph Duemer

Sure, the bent shaft and the vibrations killed the output bushing or bearing, same for the pinion bearing. You can keep on putting seals in, but with a worn bearing, the seals will fast start to leak again.

Leaky seals are only symptoms of deeper troubles, something has to make them leak.....

Mike

86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's

That's what I figured but since I've replaced the output shaft I don't know what else could be causing the problem . Could the bearing also cause the noise ? I'm thinking I'll take the spare driveshaft, have it re-balanced with new u-joints, start working the problem backwards.

Joe Carroll

2K-TJ

There are some simple truths...And the dogs know what they are." Joseph Duemer

Yes a worn pinion bearing will make a pile of noise. When I had mine replaced, my Jeep scared me for a moment it was so quiet.

Mike

86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's

Joe Carroll wrote:

Thanks, you may have just restored my sanity... Joe Carroll

2K-TJ

There are some simple truths...And the dogs know what they are." Joseph Duemer

Thanks a ton Bill...