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Unread 01-21-2011, 06:10 AM   #1
bradbb2005
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Differential Problems Black Fluid, Metal shavings

Well the title says it all pretty much, I brought my WJ to the dealer because I was hearing a Humming on deceleration and knew it had to be somewhere in drivetrain because all my other junk is new. Also had a vac leak, which they found and fixed for like 25 bucks! But anyways, they said the fluid is black, and metal shavings were found on magnet, and one of the axle seals is leaking. What do you think, replace the fluid (flush it also), and let it ride. OR rip apart the front end and try to rebuild it/replace seals. OR Replace the whole axle. I am not the most experienced with internals of the diffs, but could make it through, and I really want to go as cheap as possible (don't we all?)

What do you guys think?

OH the humming comes and goes as well, and really isn't all that noticeable.

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Unread 01-21-2011, 08:23 AM   #2
88yjproject
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It's probably your pinion bearings. If you were closer I'd give you a hand with it. Not too hard to do.
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Unread 01-22-2011, 06:21 AM   #3
bradbb2005
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What kind of time is involved?
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Unread 01-22-2011, 08:50 AM   #4
88yjproject
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Well, in the driveway with hand tools? 5 hrs maybe. On a hoist with air tools. 2 hrs. You obviously need to take apart the whole front end. Tires off, brakes off, slide axles out, take cover off, take driveshaft off. Then you are down to just the diff work.
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Unread 01-22-2011, 11:44 AM   #5
billzcat1
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Or you could just change the fluid and then top it off every 3 months or so. That's what I've been doing on my ZJ's Dana 30 for about 30,000 miles...it's turning over 200k in about a week.

Not that I'm opposed to fixing it...just that vehicles do eventually die and I always feel bad for the people who put so much time and money in only to have it completely explode a month later. So, major fixes sometimes just aren't worth the time when you really don't have any major symptoms or problems.
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Unread 01-22-2011, 03:57 PM   #6
bradbb2005
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Quote:
Originally Posted by billzcat1 View Post
Or you could just change the fluid and then top it off every 3 months or so. That's what I've been doing on my ZJ's Dana 30 for about 30,000 miles...it's turning over 200k in about a week.

Not that I'm opposed to fixing it...just that vehicles do eventually die and I always feel bad for the people who put so much time and money in only to have it completely explode a month later. So, major fixes sometimes just aren't worth the time when you really don't have any major symptoms or problems.
Kinda what I was thinking about doing for now, stay away from big bucks and just top it off at every oil change.
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Unread 01-22-2011, 06:22 PM   #7
Blue04WJ
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Hey 88-

Since you seem to know about diffs in these things, I am also having hum on decel only when cold....once car warms up it goes away) I also am having a vibe (almost like the fluttering you get when one back window is down) at 55MPH under very light throttle ....let off and it goes away) and also a loud whine at 75ish. Does this sound like pinion to you as well? These problems (except decel vibe) are consistent through hot/cold temps.

dealer has said its normal drivetrain noise for a WJ but i am about to drop it off again (still under 7/70)
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Unread 01-22-2011, 06:41 PM   #8
88yjproject
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Quote:
Originally Posted by Blue04WJ View Post
Hey 88-

Since you seem to know about diffs in these things, I am also having hum on decel only when cold....once car warms up it goes away) I also am having a vibe (almost like the fluttering you get when one back window is down) at 55MPH under very light throttle ....let off and it goes away) and also a loud whine at 75ish. Does this sound like pinion to you as well? These problems (except decel vibe) are consistent through hot/cold temps.

dealer has said its normal drivetrain noise for a WJ but i am about to drop it off again (still under 7/70)
How's your fluid? Is it the corect fluid? Have you checked your u-joints to see if they are loose at all? Pinion noise would not be at just 75 or around it. If the bearing is bad you would hear it all the time. In most cases.
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