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Discussion Starter · #1 ·
After I went to the track and ran the 1/4 mile I noticed a squeaking sound that happens on a hard shift, when shifting going up a hill (I drive with the trans in track always) this squeak sounds like a chimp monk or chirp of sorts. Its definitely on the shift and never any other time. Is it my tranny making this noise? a belt, transfer case? Any thoughts on how to determine what it could be. I do not notice any performance loss but want to make sure that this does not lead to a greater issue.

Any input is appreciated.
 

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That would be a supercharger belt (chirp) sound when the belt slips on the upper pulley. Typical when you are in track mode and the transmission shifts at a higher rpm and shifts much quicker than when running in sport or auto mode. Can also happen more often with pulley changes that spin the supercharger faster or aftermarket transmission tunes that shift quicker (firmer).

Try once driving in auto mode and likely it will not happen then you know for sure.

Annoying but nothing to worry about honestly. How old (miles) is that supercharger belt?
 

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Discussion Starter · #4 ·
That would be a supercharger belt (chirp) sound when the belt slips on the upper pulley. Typical when you are in track mode and the transmission shifts at a higher rpm and shifts much quicker than when running in sport or auto mode. Can also happen more often with pulley changes that spin the supercharger faster or aftermarket transmission tunes that shift quicker (firmer).

Try once driving in auto mode and likely it will not happen then you know for sure.

Annoying but nothing to worry about honestly. How old (miles) is that supercharger belt?
I’ll try that on my ride to work tomorrow. I think your correct that it’s the pulley belt. Belt has about 12k miles on it. I have a new belt as a spare in the event I ever need it. Should I have it tightened? Replaced?
 

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I’ll try that on my ride to work tomorrow. I think your correct that it’s the pulley belt. Belt has about 12k miles on it. I have a new belt as a spare in the event I ever need it. Should I have it tightened? Replaced?
Have a look just behind the supercharger tensioner pulley and see if you have some black belt dust built up on the motor. It is very common to see, so don't be surprised, but belt dust buildup is evidence of it slipping during shifts on the supercharger snout pulley.

Nothing to tighten really and all should be good as long as the S/C belt tensioner is within it's travel limits.

The belts live a hard life and live in a hot environment so it's not surprising that they will age/wear and have less grip over time. I would think once they start to harden and possibly glaze over they may squeek more than if using a new belt.
 

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Have a look just behind the supercharger tensioner pulley and see if you have some black belt dust built up on the motor. It is very common to see, so don't be surprised, but belt dust buildup is evidence of it slipping during shifts on the supercharger snout pulley.

Nothing to tighten really and all should be good as long as the S/C belt tensioner is within it's travel limits.

The belts live a hard life and live in a hot environment so it's not surprising that they will age/wear and have less grip over time. I would think once they start to harden and possibly glaze over they may squeek more than if using a new belt.
I now change mine every 15K miles as they aren't expensive, it keeps it new and tight and I had my first one snap on me which shut down my whole system. Luckily no collateral damage as I've seen some whip around the engine bay and do some serious damage.
 

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Discussion Starter · #7 ·
Have a look just behind the supercharger tensioner pulley and see if you have some black belt dust built up on the motor. It is very common to see, so don't be surprised, but belt dust buildup is evidence of it slipping during shifts on the supercharger snout pulley.

Nothing to tighten really and all should be good as long as the S/C belt tensioner is within it's travel limits.

The belts live a hard life and live in a hot environment so it's not surprising that they will age/wear and have less grip over time. I would think once they start to harden and possibly glaze over they may squeek more than if using a new belt.
Winter will age a belt I bet.
 

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Discussion Starter · #9 ·
I went to the dealer for my routine oil change and I had the tech working on my truck come out and I explained the squeek. He told me that the belt looked great and no adjustments needed to be made. He told me that its not unlikely that the belt stretches over time and with track runs its not uncommon to get squeaking. It does not bother me at all I just want to make sure from a safety prospective im in good shape. Sorry for not closing this out...
 

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I went to the dealer for my routine oil change and I had the tech working on my truck come out and I explained the squeek. He told me that the belt looked great and no adjustments needed to be made. He told me that its not unlikely that the belt stretches over time and with track runs its not uncommon to get squeaking. It does not bother me at all I just want to make sure from a safety prospective im in good shape. Sorry for not closing this out...
I’m pretty sure my transmission valve body is done for. I’m about to swap it out but before shifting issues started, it was making a noise at first that could be considered a squeaking noise. I think it’s the trans fluid being pushed around. Just curious what you came up with.
 

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Discussion Starter · #11 ·
so I still am thinking that Its not the belt and its coming from the rear of the car. would it be the same issue... this started last october 2020 when I was at the track. Is there any way to diagnose this? and how would It the Trans valve body? again my noise is off the shifts when in track mode.
 

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so I still am thinking that Its not the belt and its coming from the rear of the car. would it be the same issue... this started last october 2020 when I was at the track. Is there any way to diagnose this? and how would It the Trans valve body? again my noise is off the shifts when in track mode.
The valve body is where all the solenoids and such that actually shifts the trans is located. To test for valve body issues, place jeep into drive and shift up and down with the paddle shifters. If the Jeep is bucking, the valve body is allegedly the cause.
 

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I find it to be very intermittent. Other times I’m pulling to a stop and it feels like I’ve been lightly rear ended or the shifts seem very aggressive. You may want to try the paddle shifter trick a few times to see if it’ll act up.
 
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