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Old 12-30-2012, 06:52 PM   #1
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Chasing noise, front diff?

1999 TJ, 4.0, BB, 31x10.5's, AT, 150,000 mi., D30 front axle.

So I replaced both ujoints up front and the popping part of "the noise" is gone when I start from a stop. However, I now notice a faint chattering type of noise when I take off and turn. I only went around the block and parked it again. Does that sound like a diff issue to anyone else?

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Old 12-30-2012, 08:29 PM   #2
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I'm no expert but from my own experiences here are a couple of things to check.
Check the dust shields to see if they are dragging.
Check the front pinion shaft for side to side movement.

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Old 12-30-2012, 09:11 PM   #3
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No pinion play, no leaks, no dust shield noise or rubbing.

I know that I have to replace ball joints, but this doesn't sound BJ related. I also have a anti-roll bar link with some play at the socket up top.

I was hoping to get some input prior to opening up the diff tomorrow morning so at least I have a clue what I'm looking for other than the obvious broken chunks and/or heavy shavings and trashed fluid. Ah well, I'll be at it in the morning so perhaps I'll have to post up with what I find.
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Old 12-31-2012, 06:27 PM   #4
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Hmm.

So I opened the diff to find what one would only hope to find on a vehicle that hasn't been trashed or seriously neglected: A perfectly good diff with normal metallic shavings in darkish yet still amber hued fluid, at least when drizzling through the light it was. I banged around on the exhaust again after I changed out the fluid in the diff and wiggled, twisted, and shook every bit of drivetrain stuff I could get my hands on. I have no play, no slop, no leaks, no rattles.

This leads me to my next suspect:

Transmission. I'm curious about the possibility of this being in the torque converter since it only happens on take off and then fades out, unless I ease into the throttle gently up to about 10 mph or so, in which case I can avert the noise all together.


I will say that I must either be a complete idiot with the questions I am posting here or the world has mostly left me behind. Seems like folks posting in the "technical" forum about which seat covers are the best color match, or whether to get an antenna in chrome, satin, or black, or which tires "look the most aggressive" etc., get a LOT more responses and input than questions I am asking about mechanical parts I have very little knowledge about. Luckily for me I have fairly thick skin and I have to get the information sometime, somewhere, from somebody so I'll just keep searching and asking. Have a nice day.

Swapping out every part on a Jeep, one at a time.
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Old 12-31-2012, 06:40 PM   #5
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Is it only when you turn? Look for a tire rubbing the frame lightly.

And you're not getting a lot of response because its hard to diagnose a feeling and a noise.
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Old 12-31-2012, 06:45 PM   #6
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Quote:
Originally Posted by JPi4.0 View Post
Is it only when you turn? Look for a tire rubbing the frame lightly.

And you're not getting a lot of response because its hard to diagnose a feeling and a noise.

Nah, I thought after the ujoints that it was only happening on the turn. Found out on a longer drive than around the block that it happens from a stop, turning or straight. It is reminiscent of 3 or 4 puck sprung racing clutch chatter, but much more faint.

I understand the "hard to diagnose a feeling and a noise" part. I will find it eventually and remedy the situation. It drives out pretty solid for a 150k mi. rig that started as a rental in Hawaii.
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Old 12-31-2012, 06:56 PM   #7
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That can be trans, axle wrap, driveline u joints.
Check you rear control arm bushings and mounts where the are welded to the frame.

Does it do it in reverse? Back up a hill from a dead stop.

Good luck stay after it. You will find it
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Old 12-31-2012, 06:56 PM   #8
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Keep us posted, just got my first Jeep a year ago and have much to learn.

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