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Old 12-14-2009, 05:44 PM   #1
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Immediate Help NEEDED!!!

I was pulling out of my drive-way, backing up, then I went forward on the road a little at like 5 mph, and heard a THUMP, like a pop. Didn't think it was anything, then I went to the gas station up the road and heard it again driving at like 15mph... I stopped looked around in the front, saw my front axle had some leak coming from top of it... Didn't think of anything, So I pulled out, and it was veering to the right, hard to pull the steering wheel to the left, then I drove and pulled out of the parking lot and THUMP again. So I pulled in a neighborhood to turn around and go back home.
Stopped at a stop sign, pulled out and THUMP THUMP THUMP. I was literally saying, "oh shit, oh shit, oh shit." I put her in second and it went away, then third and I pushed the clutch in to down shift and when I let off, I could feel the thump coming and it was barely there...

WHAT IS WRONG!!??? Is it my rear axle? I felt it coming from the rear, is it skipping gears or something?? HELP ME PLEASE!!

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Old 12-14-2009, 05:53 PM   #2
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sounds like possibly the rear diff. Check your driveshafts also. If not, jack up the rear of the jeep and turn the wheel by hand to see if you hear anything.

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Old 12-14-2009, 06:00 PM   #3
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Should I pull off the rear diff and check the gears?
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Old 12-14-2009, 06:09 PM   #4
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Anyone else? please.
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Old 12-14-2009, 06:54 PM   #5
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I'd check the driveshafts to see if they are the culprit first. Start by just grabbing it and giving it a good shake (not twisting as there will be some play if you twist or turn it, but if you try to shake or wiggle it, it should not move) if there is any play then remove the DS and drive around without it (in 4x4 if you remove the rear). Because you mention a POP, it makes me think of a U-Joint . . . which could be either on your DS or front axle, so if the DS are fine, see if your U-Joints on the axle are good. What's throwing me is the veering to the right as that just doesn't seem to go along with the other things that come to mind.
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Old 12-14-2009, 07:42 PM   #6
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As stated start with the easy stuff 1st. check drive shaft and axle shaft u-joints. If those are good, Then you need to check the diff. Before you pull the cover, get somebody to slowly drive the jeep forward. Look at the each drive shaft where it connects with the diff, and if it looks like it skipping as it turns, then you could have a gear issue inside the diff.
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Old 12-14-2009, 08:44 PM   #7
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OK. I will try that tomorrow. Thanks guys!
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Old 12-14-2009, 08:55 PM   #8
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how high is your lift,nice looking jeep,do you have a slip yoke eliminator.
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Old 12-14-2009, 09:17 PM   #9
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I have 4" suspension and 1.25" Body. To tell you the truth... I'm not sure, bought it from friend and he never mentioned it..
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Old 12-14-2009, 11:40 PM   #10
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I'd be more inclined to think a lose control arm or a control arm bushing being worn out...my old Dakota had the driver's side control arm come loose and when I was backing up and hit the brakes, 'CLUNK!"

Then later as I was driving forward..."CLUNK!"

I finally tracked it down to the control arm...and some of the times, my alignment was way out of whack.

Might be something to check even though you *think* it's coming from the rear...

Edit:
Okay...re-read the post...prolly isn't a control arm...does sound more diff. related.
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Old 12-15-2009, 12:16 AM   #11
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While your down there looking at the U-joints...take a look at the trans mount.
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Old 12-15-2009, 11:24 AM   #12
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Ok. I will. This might be a noob question, well it is, but where/what do the U-Joints look like?
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Old 12-15-2009, 11:41 AM   #13
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Ok. I will. This might be a noob question, well it is, but where/what do the U-Joints look like?


You'll have them in your driveshafts and on your front axle. They tend to make a popping noise when they are bad . . . that'll be followed by one of the ends snapping and it'll usually take out the yoke and possibly other stuff. If there is any play in the U-Joint, it needs replacing.
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Old 12-15-2009, 11:48 AM   #14
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Ok thanks. Are they at the ends of the driveshafts?
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Old 12-15-2009, 12:18 PM   #15
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Ok thanks. Are they at the ends of the driveshafts?
Depends on the type of DS...you should have at least one on each end ... maybe an extra one in the middle if you have a CV DS. They are hard to miss on the DS. Just shake the DS and if you feel any play, yank it out and see if your noise is gone. If the DS is the culprit, it could be the U-Joints or if you have a CV, it could be the center ball has gone out. On the front axle, you'll see the U-Joint between the two yokes by the knuckle . . . I think you should be able to jack up the axle and see if there's any play in the U-Joint by moving the tire around when it's off the ground.
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Old 12-15-2009, 12:22 PM   #16
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Ok. I'm having a friend come over later today and we are going to check it out. I think I know what your talking about though. Earlier this morning I went out and tried to "shake the rear DS, and nothing. I will check the front soon.
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Old 12-15-2009, 01:58 PM   #17
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How much do the U-joints run for? $
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Old 12-15-2009, 02:01 PM   #18
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Old 12-15-2009, 02:53 PM   #19
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You'd need to make sure you get the right size . . . 1310 and 1330 are what my DS takes . . . I want to say my front axle takes a X-570 but it's been a while . . . make sure you double check cuz different axles, DS, etc take different U-Joints. That price seems pretty low...make sure the quality is there . . . the ones for my DS are about 20-25 bucks...I think the axle one was a bit pricer...again it's been awhile.
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Old 12-15-2009, 05:09 PM   #20
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Ok. I went back under and checked the front DS, didn't move, went back to rear again, I could move it left and right... Not much but it did move... What does that mean?
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Old 12-15-2009, 05:17 PM   #21
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Ok. I went back under and checked the front DS, didn't move, went back to rear again, I could move it left and right... Not much but it did move... What does that mean?
Doesn't take much play to make a ton of racket. When my center ball went on my rear DS, I was scared and thought my tranny was toast. It may turn a bit and you'll see everything turn together (both at the TC and diff), but you should not be able to move it back and forth or shake/wiggle it and get it to move at all. Just pull the rear DS (just 4 bolts on each side of the DS) and drop it into 4H and drive around in front wheel drive and see if the noise is gone . . . if so, chances are you just found your problem. Rebuild your DS with new UJs (if it's a CV DS, you probably need to have the Center Ball replaced too). I had my CV DS rebuilt and reblanced with 3 new UJs and CB for about 150. Good luck!!!
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Old 12-15-2009, 05:25 PM   #22
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I will try that when my friend arrives. Thanks everyone.
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Old 12-15-2009, 06:48 PM   #23
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i had that same problem minus the pulling to the right and it was the u-joints in the driveshaft.. they were REALLY messed up! i opened a couple of them up and they were like all dust! but after i replaced those everything was fine..
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Old 12-15-2009, 08:32 PM   #24
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i had that same problem minus the pulling to the right and it was the u-joints in the driveshaft.. they were REALLY messed up! i opened a couple of them up and they were like all dust! but after i replaced those everything was fine..
Yeah that whole pulling to the right thing threw me off too, but when my DS went, the noise and vibe had me thinking all sorts of things!!! Hopefully it'll be a simple fix with just some new UJoints. I have a CV so it needed other stuff besides the UJs, but I'd imagine if all you have to do is replace a couple of UJs, it should be under 50 bucks and something you could do yourself. I'm not sure if it would be necessary to get it balanced if all you did was replace the UJs.
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Old 12-15-2009, 09:45 PM   #25
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We pulled the diff cover off and found out that it was the spider gears. Opened it up and teeth shavings came out, came out on the paper towels and everything. Ordering a new one tomorrow.
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Old 12-16-2009, 12:38 AM   #26
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Was pulling for you hoping it was just something cheap and simple like the UJoints. Are you going to do the install yourself? How much is the new spider gear going to set you back?
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Old 12-16-2009, 12:54 AM   #27
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Thanks. I looked up and the spider gears are 75$.. idk about shipping though, and I'm doing it myself because I don't want to pay so much more for labor. I'll post some pictures up tomorrow of what they look like now.

I might go find some U Joints to replace too, just incase.
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Old 12-16-2009, 12:25 PM   #28
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Can anyone send me a picture of where the U joints are?

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