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Old 02-04-2013, 09:57 PM   #1
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metallic rattling under my tj?

okay, so im new to the forum, i have a 2000 jeep sahara, it recently started rattling and clanking underneath the floorpans and sounds like its in the center, ive checked everything under it and nothing seems to be loose or cracks, its really got me beat? advice pleaseee!

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Old 02-04-2013, 09:59 PM   #2
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Shifter linkage is a common rattle there.

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Old 02-04-2013, 10:37 PM   #3
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Exhaust against the skid plate as well...
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Old 02-04-2013, 10:42 PM   #4
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Shifter linkage is a common rattle there.
I have seen this and the exhaust hitting the skid plate OR it could be a bad transmission mount had the same thing happening to a 02 I was working on. A quick was to find out if it is the trans mount undo your six bolts holding the skid plate if it comes all the way off without unbolting the trans mount from the plate the the mount is BAD it takes about 20mins to do... If the mount is good it should hold the skid plate mostly inplace it wont let it fall to the ground.
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Old 02-04-2013, 10:42 PM   #5
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Check the muffler too. Grab it and see if there is a broken weld.
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Old 02-04-2013, 11:26 PM   #6
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It's a jeep thing, don't worry about it.


Just crawl under there and find what's loose. Very likely exhaust.
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Old 02-05-2013, 05:56 PM   #7
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Thanks for the advice, im going to crawl under it tommorow and check to see whats loose and check the trans mount
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Old 02-05-2013, 07:33 PM   #8
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My transfer case linkage was knocking really loudly against the tub. Here's a write up on how to fix it if that's your problem. TCaseTSB
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Old 02-06-2013, 01:47 PM   #9
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so i jacked it up today and got all wheels off the ground and put it in gear in 2wd and i didnt hear the noise, so i put it in 4wd and put it in gear and i heard the noise and it is coming from the transmission and Tcase area. it sounds like its rotating. i checked the fluid in the Tcase and it was good. could it be the TO bearing or what?
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Old 02-06-2013, 02:02 PM   #10
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so i jacked it up today and got all wheels off the ground and put it in gear in 2wd and i didnt hear the noise, so i put it in 4wd and put it in gear and i heard the noise and it is coming from the transmission and Tcase area. it sounds like its rotating. i checked the fluid in the Tcase and it was good. could it be the TO bearing or what?
It could be the chain in the transfercase is a little stretched...


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In this picture you see the drive chain for the front output shaft, that chain only spins when in 4wd so it COULD be your problem...
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Old 02-06-2013, 02:07 PM   #11
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it does it when im not in 4wd, pretty much whenever the front wheels are rotating and the front driveshaft is turning
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Old 02-06-2013, 02:15 PM   #12
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Mine was like that and it was the front drive shaft cv joint. Then about 6 months later the rear did it but it was only the u-Joint
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Old 02-06-2013, 02:35 PM   #13
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it does it when im not in 4wd, pretty much whenever the front wheels are rotating and the front driveshaft is turning
It sounds like it is the cv joint in the front driveshaft then it is time to pull it out and rebuild it... How many miles do you have on your jeep and have you done any u-joint maintenance if so at what miles???

U-joints and driveshaft cv joints are suppost get greased every 12-15k miles....
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Old 02-06-2013, 02:38 PM   #14
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i pinpointed it to that spot., it sounds like it running up and down the driveshaft. i drive it every day and it has 107k ,miles on it. i havent done any maintence on the u joints since i got it from the previous owner
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Old 02-06-2013, 02:42 PM   #15
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Good u joints arent that expensive so it wont cost you a arm and a leg to fix it, just about $25-$30 a u joint and about 1hr if you have access to a good press it really makes it is a lot easyer....
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Old 02-06-2013, 02:50 PM   #16
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alright, thanks for the help everyone
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Old 02-11-2013, 07:00 PM   #17
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so i pulled the driveshaft and removed the u joints and they wear really worn and replaced the bearing in the yoke and put it basck in and havent heard the noise al day. hunting down the bearing for the yoke took the most time. install was easily done.

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