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I've ran valvoline dex/merc in 4 of my XJs and never had a problem. All of them are 200K + mileage trans. Always red and smells good. ATF+4 is a Chrysler trans fluid used in a lot of the 90s because...

So it's been quite awhile since an update. So I replaced the trans mount and fought my crossmember off because I bent it from a wheeling trip. Ended up pulling one out of a junkyard and installing...

Well i took a video and the audio quality is horrendous when the actual noise happens. I guess it's at a frequency where my phone mic won't pic it up. This is when I had the vehicle on jack stands...

I've removed the front awhile ago for the same reason and it didn't go away. Its a stock jeep other than the air shocks but pinion angles looks straight. I wonder if the splines on the output shaft...

So I crawled under the XJ today and my pinion bearings feel fine. U joints look good. However where the splined end slips on the tail to the t case there is some slop there. And with the rear axle...

True. Sorry 241***

Thanks for the quick responses. I'll try to get at it this week and find the problem and report back. At the cost of seals, I suppose a axle swap is cheaper in the long run.
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Gosh it's gotta be getting close to changing. But it's always full and looks alright. Shavings not really. But let's say worse case the pinion bearing is bad. I have a Chrysler 8.25 laying around for...

hmm.... good to know that little gap created all that vibration! and thanks for the quick reply. The tires are all balanced and just rotated last oil change. doesnt seem to worsen or help the issue....

So my 97 XJ with 203,XXX has developed a pretty bad drive line vibration at anything over 65 MPH. The XJ is bone stock with the upcountry package and some 31 BFG ATs. I have a front and rear JCR...

Thanks. Thats also a great jcr product. The new one they're making is even better!

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I have the smitty xrc8 with synthetic on my blue XJ with the jcr bumper and a warn m8000 and another jcr bumper on my green XJ. I have abused the smitty. To the extent of dead heading it, snapping...

This is my trail rig
2503

One day earlier! Yay!