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Old 06-01-2008, 05:21 PM   #1
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Angry Front end issues

A couple of weeks ago I replaced U joints in my front drive line. I had some vibes, turned out to be the joint at the pinion. While I was at it I replaced both hub unit bearings because one was suspect. That cleared up the vibes. Now two weeks later I have vibes again and kind of a knock up front sometimes when I take off and when wheeling, when the weight of the Jeep transfers to the front. Poking around up front it seems there is a slight click/play in the front passenger U joint when I rock the Jeep back and forth.
According to the manual it could be U joints, bearing spacers at the ring gear or play in the pinion shaft. The pinion seems to be very firm (no play) and the bearing spacers have not bee checked. The axle U joints are an easy fix but it means tearing apart the front end again and I just had the front end torn apart.

Whats your take on this?

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Old 06-01-2008, 07:20 PM   #2
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should've done the u joints when it was apart

replacing u joints is a good idea if they're old anyway.

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Old 06-01-2008, 08:07 PM   #3
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You're right Doc after I posted this, I thought why did I post that.
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Old 06-02-2008, 06:12 PM   #4
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I'd say that if you don't have any slop in your axle yoke then your issue is probably a Ujoint cap walking out on you. Depending on how hard you wheel it, if you have upgraded shafts already, and your dollars and cents situation you might want to think about upgrading your ujoints. I'm running Yukon Super Joints in mine and it's just another peace of mind situation. However I wouldn't suggest buying upgraded joints if you are still using the stock shafts. The metal they use on those is just not good enough and the ears will open up and ruin the good joints.

No matter what you do I'd suggest marking your caps when you put the new ones in. It'll be easier for you to tell in the future if your caps are spinning.
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Old 06-02-2008, 06:16 PM   #5
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You're right Doc after I posted this, I thought why did I post that.
why did i post that, or why didn't i do it?

i agree w/ 1blkjp
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Old 06-02-2008, 06:17 PM   #6
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I've got another question on this. If you grasp the drive line and rotate it, how much play would be normal? Front or rear.
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Old 06-02-2008, 06:18 PM   #7
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why did i post that, or why didn't i do it?

i agree w/ 1blkjp
Yeah yeah, hind sight is always 20/20
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Old 06-02-2008, 06:20 PM   #8
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just turning the driveshaft while vehicle is parked??
rotating it like it spins normally right?

there should be some play, about 5/16" maybe, if its not noticeably loose you're fine. there's space between the ring and pinion basically is what you're feeling if i read this right
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Old 06-02-2008, 06:21 PM   #9
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Quote:
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I've got another question on this. If you grasp the drive line and rotate it, how much play would be normal? Front or rear.

rotationally speaking there will be a little bit of play. That's backlash on your gears and there will always be a little bit (read minimal). What I was talking about was if you had your shaft off and you could slide your yoke in and out much or with ease.
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Old 06-02-2008, 06:28 PM   #10
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rotationally speaking there will be a little bit of play. That's backlash on your gears and there will always be a little bit (read minimal). What I was talking about was if you had your shaft off and you could slide your yoke in and out much or with ease.
Yes, I get what you're saying. It slid in/out just fine. I was just wondering about rotational play on the pinion. I had checked it in the past and it seemed fine. As JDoc said and what I have is appx 1/4" play. I was just curious as to what would be considered normal.
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Old 06-02-2008, 06:32 PM   #11
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^you couldn't move the yoke in and out though right? the part the ujoint bolts to on the axle. that didn't move in and out i think is what 1blkjp is saying.
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Old 06-02-2008, 06:38 PM   #12
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^you couldn't move the yoke in and out though right? the part the ujoint bolts to on the axle. that didn't move in and out i think is what 1blkjp is saying.
Let me rephrase that. No, not when it was connected to the diff. I guess I misunderstood exactly what Jack was saying. When i changed the U joints in the front drive line (disc from the diff) the yoke slid in/out smoothly.

I think I'm on the same page as you guys now.

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