Please help diagnosing this grinding sound (probably) around tranny pan - JeepForum.com
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post #1 of 8 Old 10-01-2021, 08:44 PM Thread Starter
Jvanbev1
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Wj Please help diagnosing this grinding sound (probably) around tranny pan

It happens when I give it gas (any amount of gas - louder with more gas). It sounds like it's coming from above the transmission pan. Any ideas what it could be specifically?

I used to only get this (or similar) sound when letting off the gas at >40mph, then going back on the gas. But now it is any time I give it gas. The only different thing is that I replaced the PCM.



Thanks

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post #2 of 8 Old 10-01-2021, 09:35 PM
Mattyjm
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It could be a cable rubbing against your driveshaft. I can't remember which one it is, but look for wear spots on your driveshafts and cables being close to them.

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post #3 of 8 Old 10-02-2021, 07:43 AM
Delta0
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Have you checked the lube in your transmission & transfer box for level & condition yet J?
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post #4 of 8 Old 10-05-2021, 10:00 PM
Bigrigr
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My vote is something metal rubbing against the exhaust somewhere...

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post #5 of 8 Old 10-05-2021, 10:10 PM
WJ60
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Does it do it in park, or only when moving?

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post #6 of 8 Old 10-06-2021, 07:52 AM
Mr. Bitey
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Sounds like a heat shield on the exhaust to me. He is throwing revs at it while in park - can't be the driveshaft....
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post #7 of 8 Old 10-06-2021, 08:19 AM
WJ60
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I'm going with Mr. Bitey on this one. I had a Chevy Blazer that had the same noise and it was the heat shield on the cat convertor.

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post #8 of 8 Old 10-06-2021, 11:56 AM
mak_v8
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I heard a similar noise with a cat whose internal ceramic part was in pieces; vibration of this pieces, knocking on the cat case caused a similar noise.
Mr. Bitey hypothesis is also possible.

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