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Old 04-27-2013, 05:16 PM   #1
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Keep ruining U-joint

My rear ujoint that connects the axle and driveshaft keeps siezing up. I purchased the jeep 2 years ago and have put 5,000 miles on it so far. I replaced the original that was on it when i bought it adn it lasted around 150 miles. I replaced it under warranty and have about 30 miles on it and its already dead. The needle bearings are warn out and they were hot to the touch. Any idea of what could be going on?

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Old 04-27-2013, 05:40 PM   #2
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If you installed the u-joint correctly, it sounds like your pinion angle is way off.

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Old 04-27-2013, 05:48 PM   #3
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Is it a sealed type or greasable? If it does have the zerk fitting, did you grease it enough when installed?
As mentioned above, what are you're drive line angles, pinion and drive shaft? Any vibrations when driving?
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Old 04-27-2013, 05:52 PM   #4
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Might have me being taken for a "sucker" but it made sense to me...when mine went bad replaced both...each end...figured it made sense one is worn other probably as well....however IDK if a bad one on one end can "ruin" the other......
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Old 04-27-2013, 06:43 PM   #5
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Ive had the lift in for the past 4,500 miles or so and have never lunched one as quickly as this. i have a transfer case drop and some vibes but nothing to warrant 30 miles on a ujoint. They are greasable moog super strengths. The cups that are giving out have been where the joint is held on by the straps on the axle both times
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Old 04-27-2013, 07:54 PM   #6
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No drivetrain vibrations are acceptable, they can't just be lived with... any drivetrain vibes will eventually take out things like the u-joints, seals, and/or bearings.

A 1" t-case drop is not enough to counteract the excessive u-joint angles that a 4" suspension lift causes. Those excessive u-joint angles cause u-joints to heat up & fail. Not to mention I'm no fan of Moog greasable u-joints, I'd run nothing but the Spicer sealed 5-1310x u-joint on the driveshaft which is a stronger/more durable u-joint.

But before wasting any more $$$ on more u-joints, fix the excessive u-joint angles. For a 4" suspension lift, the right way is by installing a SYE kit and aftermarket CV driveshaft.

A temporary band-aid fix is to either drop the t-case more or add a 1" motor mount lift that may even not be enough.

In closing, again, no amount of drivetrain vibration can just be lived with. Get rid of the vibrations or continue replacing your u-joints. Which can eventually lead to pinion shaft bearing failures, seal failures, etc.
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Old 04-29-2013, 08:03 AM   #7
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Thanks Jerry it just seemed a bit odd that it lasted the first few thousand miles and then is going through them so quickly. I do plan on doing the sye in time i just saw there was a hack and tap option but im still confused on if it works for wranglers or if its just for cherokees.
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Old 04-29-2013, 09:31 AM   #8
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There is a hack 'n tap available for the TJ which in my opinion, works fine.
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Old 04-30-2013, 05:39 PM   #9
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Thats all i want to do. I have looked around and read up on them and have never seen someone say it has failed so im going to give it a try. Thank you for the help
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Old 04-30-2013, 09:57 PM   #10
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Quote:
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The cups that are giving out have been where the joint is held on by the straps on the axle both times
Are you using a torque wrench on the bolts that fasten the straps to the pinion?
Overtightening the straps will cause excessive wear on the joints, more particularly, the two trunions that your are referring to.
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Old 05-01-2013, 07:03 PM   #11
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I only use a 1/4" ratchet and snug them up. I dont think i crank on them too hard though
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Old 05-01-2013, 07:12 PM   #12
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Quote:
Originally Posted by Vinman View Post
Are you using a torque wrench on the bolts that fasten the straps to the pinion?
Overtightening the straps will cause excessive wear on the joints, more particularly, the two trunions that your are referring to.
You're thinking of u-bolts which some replace the straps with. It is easy to overtighten those u-bolts but not the OE straps that hold the u-joints into the yokes.
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Old 05-01-2013, 10:03 PM   #13
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You're thinking of u-bolts which some replace the straps with. It is easy to overtighten those u-bolts but not the OE straps that hold the u-joints into the yokes.
I know the u-bolt style will defintely damage the joints if improperly torqued but have also been told by a driveshaft shop the overtightening the straps can also cause damage. IIRC, the proper torque is only about 12 ft lbs on those straps which can easily be exceeded with even a 1/4" drive ratchet.
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Old 05-03-2013, 12:06 AM   #14
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What is a hack 'n tap? I have driveline vibration problems. I am changing things as I can, but all the aftermarket crap is expensive as hell! I have installed an adjustable rear track bar and will be installing rear adjustable upper control arms next week to fix my pinion angle. I really dont want to dump the money into a slip yoke eliminator and new driveshaft. So anything else I could do with out breaking the bank would be awesome!
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Old 05-22-2013, 09:45 PM   #15
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So after ordering my hack and tap kit i got under the jeep and my tailshaft is slightly bent. I noticed after i put the tape on to mark the line and noticed it looked to wobble a little as i spun it around. Looks like ill be ordering a sye kit that comes with a new shaft instead of the HnT
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Old 05-23-2013, 04:52 AM   #16
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That would explain the u-joint issue....CONGRATS ON THE SYE!!! I keep saying one of these days........

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