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Old 09-22-2012, 08:08 PM   #1
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Unhappy rattling tranny at idle.

Hi all- I'm new here, what a great site you all have. My daughter bought a 98 tj wrangler with me the axe mechanic--I mean ace mechanic looking it over before she bought it. I checked it out and gave her the green light (I negociated the price, (not a bad deal-so it seemed!).
now apon further review I hear a rattling noise from the trannny , I think its internal-sounds like it. truck runs perfect. cant hear noise whiolle driving. what do you thinK? bad tranny ready to go out? I cant believe it - it runs so good- but it just rattles off and on whiloe idling? thanks

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Old 09-22-2012, 09:06 PM   #2
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Does it quiet down when you push the clutch down? Could be a noisy pilot bearing like mine has and does that.

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Old 09-22-2012, 09:12 PM   #3
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Mine does the same thing so I checked the service manual and it said among many things like bad input shaft bearings and it could be low on oil.
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Old 09-22-2012, 09:33 PM   #4
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My 05 rubicon has done that for 6+ years. Rattles when idling. Step on clutch and it goes away. Haven't figured out what it is but it hasn't caused any trouble.
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Old 09-22-2012, 09:39 PM   #5
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Quote:
Originally Posted by Blind Dog
Does it quiet down when you push the clutch down? Could be a noisy pilot bearing like mine has and does that.
^X2 on that. Either pilot bearing or throw out bearing.
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Old 09-22-2012, 10:50 PM   #6
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Nothing to worry about, Most jeeps make the noise Its a jeep thing .
My last jeep jingeled for 100,000 mils
My rubicon makes the same noise at 80,000
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Old 09-23-2012, 05:31 AM   #7
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Thanks all- That was fast replys- I forgot to mention its an automatic tranny. The noise isnt contsant- at idleit comes and goes. I replaced the 2 rear rubber exhaust hangers that were cracked in half (the one at the very end of pipe and the next one a few feet towards the front). Is there any more hangers then the 2 I replaced? I couldnt see any more- that shield covers the pipe. Im hoping its just an exhaust rattle but everything feels tight when I checked it.
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Old 09-23-2012, 10:25 AM   #8
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Does an automatic use the little pad at the bottom between the trans and skid plate like a manual does? I forget what its called right now but if it breaks like they often do it can cause rattling between the trans and skid plate
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Old 09-23-2012, 03:03 PM   #9
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^^^ Yeah maybe that.
Also maybe you got a loose heat shield over the cat or something. They rattle harsh and like to come and go at idle.
Can you post a video link with sound?
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Old 09-23-2012, 04:28 PM   #10
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Quote:
Originally Posted by jeepwayoflife
Does an automatic use the little pad at the bottom between the trans and skid plate like a manual does? I forget what its called right now but if it breaks like they often do it can cause rattling between the trans and skid plate
The transmission mount?
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Old 09-23-2012, 04:37 PM   #11
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Quote:
Originally Posted by jherrington

The transmission mount?
Haha yeah sorry, I had just woken up. They are pretty easy to get to, you just need a jack or a jackstand to hold up the transmission as you lower the skid plate. They are also cheap to replace if thats it. I used to have a rattle at 1900rpm in 1st and 2nd gear only. Turned out to be my old pro comp MT's. Got new tires and no problems. The old ones were just very worn out. Something to think about, but of course check all bolts, push the exhaust system around to see if it hits anything, check the heat shields, make sure all zerks are oiled, and make sure there is no play in any suspension or drivetrain parts.
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Old 09-23-2012, 06:01 PM   #12
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Skid plate bearings? Muffler belt?

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