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Old 11-20-2013, 10:39 AM   #1
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Strange grinding/whining noise

Hi Guys,

I have a 1999 Jeep Wrangler Sport with a 4.0 and 5 speed manual trans. The other day I noticed a slight whining noise when I let off the gas. It went away when I gave it gas to speed up. Yesterday I had no issues until I went to lunch. On the way back (only 1 mile away) whenever I pushed on the clutch (or just put it in neutral) or let off the gas there was a strange grinding noise...it seemed to even slow down my jeep. I took a chance and drove it home (10 mile drive) and had no issues until I exited the freeway. No grinding but still a slight whining noise when I let off the gas. I don't think it is clutch related because there is no slipping, I can shift just fine and it happens when out of gear as well. Any ideas?

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Old 11-21-2013, 06:20 AM   #2
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Possibly could be a bad fly wheel.... if it happens only when clutch is engaged. Try up loading a video of the sound. But with info given I would guess fly wheel.

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Old 11-21-2013, 11:11 AM   #3
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If it was the flywheel would it still do it in neutral? I've been driving the landcruiser to work but I will drive the jeep tomorrow and see if it does it again and I will try to record it. The wierdest thing is that it did not do it on the drive home. I even stopped at the store to see if it would make the "grinding" noise again but it did not. There was still the slight "whining" noise when I used the compression of the engine to slow down (let off the gas). I wanted to check with you guys and some buddies before I drove it again. From what I have been hearing I most likely have to drop the tranny to find the problem. I will keep you posted and anymore suggestions/ideas are much appreciated.
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Old 11-21-2013, 07:49 PM   #4
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It should not be doing it in neutral. But if fly wheel gear is cracked it could catch. Also could be a torque converter. Wish I could be more helpful work this
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Old 11-21-2013, 08:19 PM   #5
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Sounds like a bearing in your differential. Same happened to me last year and it was my pinion bearing.
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Old 11-21-2013, 09:22 PM   #6
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Quote:
Originally Posted by itscakes View Post
It should not be doing it in neutral. But if fly wheel gear is cracked it could catch. Also could be a torque converter. Wish I could be more helpful work this
No torque converter on a manual by the way...that's just an auto thaang
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Old 11-22-2013, 08:24 AM   #7
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Well I did not drive it to work today. I drove it about a bit yesterday and had no issues. I'm very confused. I will take it for a longer drive this weekend and see what happens. Thanks again for all the feedback.

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