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Old 06-15-2011, 02:58 AM   #1
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HELP! manual transmission noise in neutral after warm-up

98 wrangler 4.0 manual.. after warm-up I hear a knocking noise when in neutral around where the tranny meets the motor... when I put it in gear and let the clutch out it stops... any ideas?

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Old 06-15-2011, 03:36 AM   #2
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I have tge same thing. Wen i turn my jeep off and the gear is in nuetral and the cluth is out i also get a rattling. Every mechanic i asked said its k and normal. One said its the presure plate springs just rttlig and one said its the throw out bearing. But i would go with tge the springs it makes more sense. I hope someone with a little more sure answer could answer you. Gd luck.

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Old 06-15-2011, 07:29 PM   #3
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My '06 manual does the same thing. When your in neutral, the clutch just spinning freely. It can be annoying for some but completely normal.
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Old 06-15-2011, 07:56 PM   #4
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What you are hearing is the completely normal sound of the transmission's input shaft and bearings being spun by the engine. Stepping down on the clutch pedal stops the input shaft and bearings from spinning. You can hear it because there is very little soundproofing in a jeep and that is it is a noisy truck transmission.
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Old 06-15-2011, 10:38 PM   #5
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Before I rebuilt the engine it never did that.. also, it makes Tue noise even if I step down on the clutch in neutral... it only stops when I put it in gear and start going...
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Old 06-18-2011, 05:55 AM   #6
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OOhhhhhhh!!! Well now I'm lost too. Any of the gearheads know whats going on?
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Old 06-18-2011, 07:45 AM   #7
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I thought I had a problem when I bought my Tj new. Brought it to the dealer asking why all this noise it the tranny?? It's completely normal as said previously.
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Old 06-18-2011, 04:39 PM   #8
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Don't want to sound stubborn but this isn't normal.. never heard it before my rebuild..
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Old 06-18-2011, 04:41 PM   #9
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Quote:
Originally Posted by slAmArAm View Post
Don't want to sound stubborn but this isn't normal.. never heard it before my rebuild..
We can't guarantee what you're hearing is the same noise as is normal for a TJ's transmission when it is neutral and the clutch pedal is up. Of course your transmission could have a problem, we are just saying that the TJ's transmission is naturally noisy. Your noise may not be the normal noise we were referring to.
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Old 06-18-2011, 05:01 PM   #10
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Quote:
Originally Posted by Jerry Bransford
We can't guarantee what you're hearing is the same noise as is normal for a TJ's transmission when it is neutral and the clutch pedal is up. Of course your transmission could have a problem, we are just saying that the TJ's transmission is naturally noisy. Your noise may not be the normal noise we were referring to.
Agreed!!
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Old 06-18-2011, 05:20 PM   #11
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You could be hearing the normal noise from the transfer case chain. Sounds like that travel.
Go under and use a short piece of heater or garden hose like a stethoscope to locate the source. The T-case chain flops around a little when there's no load on it. Not a problem.

You probably just never noticed it before - or you put new mounts (poly?) in that transmit the noise more.

An awful lot of gears and bearings are turning in neutral - with no load to stop them from rattling.

Neutral, clutch pushed down everything stops turning - no noise. In any gear, clutch up or down there's enough load to stop the rattle. Worry if accelerating it makes noise.
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Old 06-22-2011, 10:35 PM   #12
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Called a friend of the family who owns his own shop and explained to him what's going on.. off hand he told me its most likely the thrust bearing and not a tranny issue bc the tranny stops moving when the clutch is down and u can still hear the noise until I put it in gear and let the clutch pedal loose ... gotta get out to the shop and see how much endplay I have in the crank.. if that's not the case I'm just gonna drop the tranny and crank and check everything

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