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Old 10-12-2011, 06:36 PM   #1
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Whirrrrr noise associated with gas pedal position

Here's what I got... I'd love to hear your thoughts on this.

A month ago, I rebuilt my front driveshaft, installed new ball joints, axle ujoints, and swaybar links.

Drove around for about 2 weeks without the driveshaft installed. After reinstalling the driveshaft, I noticed a "whirr" noise that occurs anytime I let my foot off of the gas pedal slightly. It does not occur when my foot is completely off of the gas pedal. It does not occur when I am giving the jeep a good amount of gas. It only occurs when I lift my foot mostly off the pedal. If I hold my foot in the position where it makes noise, it will make the noise for a long period of time. It does not matter how fast I am going, the noise sounds the same if I am going fast or slow, but I do have to be moving...

I removed my front driveshaft and thought that would eliminate the noise. It did not. The noise is equally bad with or without the driveshaft installed. Then noise IS NOT associated with any amount of turning to the left or right.

I had been thinking that the front differential bearing was bad, but would that make this type of noise when the driveshaft is uninstalled?

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Old 10-12-2011, 07:10 PM   #2
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sounds like it might be the rear.... i have the same issue and it is very noticeable when i'm on the highway and goes away or changes tone when i lift off the throttle... sounds like we have the same issue... btw, i've been driving around like that for about 5 years now...

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Old 10-12-2011, 09:58 PM   #3
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5 years? Whoah! My noise sounds like something is going to fly apart... I put the jeep on jack stands (only rear) and took her up to speed. Heard the same noise coming from transfer case at 30-40 mph, but it would happen under load in these conditions. Foot on gas it would "whirrr" at 30-40 mph.

So it's in the transfer case... I will probably have a shop take a look at it. Not much time before the snow flies and I don't have a garage. Bummer.
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Old 10-12-2011, 10:06 PM   #4
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Sounds like the rear diff to me. Had that happen twice with my XJ, and my sister had it happen with her Amigo. Although based on you getting it up on jackstands, maybe the TC after all.
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Old 10-13-2011, 11:50 AM   #5
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Yea, it's not that bad on mine. It's most likely the pinion bearing. I will change it eventually..
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Old 02-01-2012, 10:23 AM   #6
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I am having the same issue....
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Old 02-02-2012, 12:42 AM   #7
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I still haven't tried to fix the noise. I still believe that it is in the transfer case, but I am waiting for the snow to go away. It was -50 F last weekend! Anyhow, the noise has definitely gotten worse over the winter. It occurs more regularly in more positions of the gas pedal and it is louder than it used to be.

I think that may have caused this problem when I rebuilt the front driveshaft. I remember that after rebuilding it, the double cardan joint did not move freely in any direction. I took it apart and rebuilt it again, but I believe that the damage was done. This is another reason that I think that it is the transfer case.

Anyhow, I will attempt to fix this (probably in May). My plan is to rebuild the transfer case. I am hoping to find a used one to rebuild so that I can almost swap mine out with the new one. Its my only vehicle so it would be inconvenient to have the jeep disabled if I needed to find another part or something.
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Old 02-03-2012, 12:26 AM   #8
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I took the front gears out, i am running 2WD right now. I hear the noise at 35-40mph thenit seems to go away.i have replaced ALL fluids. Idk what it is
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Old 02-03-2012, 02:41 AM   #9
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Does the noise occur if you have the drive shaft removed? Can you replicate the sound if you put the Rear end on jack stands and bring it up to speed? Can you have some body else push the gas while you lau next to (not under) the Jeep tho hear where three sound is coming from?
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Old 02-04-2012, 02:47 PM   #10
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Drive shaft is out, haven't tried jacking it up yet, only happens in gear though
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Old 02-07-2012, 12:23 AM   #11
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Its pretty dangerous to put you Jeep up on Jack stands and then accelerate up to 30-40 mph. I wouldnt advise other people to do it. All it takes is a small bit of torque for your suspension to attempt to cycle and you can come off of those jack stands pretty quick.

Damage will ensue shortly after. I dont wanna hear about a fellow Jeeper dying in such a manner.
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Old 02-07-2012, 01:43 AM   #12
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I agree, completely with minuteman...

I has a thought today... Bg1980, are you running without your skid plate? I recently stumbled upon a thread that recommended against this, however I have had mine off for a while because one of the bolt inserts was stripped. Now, I realize that my noise occurs regularly when I hit dips in the road and I am wondering if my transfer case being unsupported has a wrong angle with the driveshaft under specific conditions thus causing this specific noise. Hmmm...
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Old 02-07-2012, 02:02 AM   #13
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The transmission mount is attached to the skid plate...I believe if you are running without the skid plate then your driveline is unsupported and that's probably where the noise is coming from.
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Old 02-09-2012, 01:52 AM   #14
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No skid plate is on! Still have the noise and it is getting worse, not slipping gears or having any trouble shifting, ONLY hear the grinding noise when pressing gas pedal , left off and it stops..is only really bad between 30-40mph...
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Old 02-10-2012, 12:21 AM   #15
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BG1980, just for clarification, are you saying that your skid plate is on your Jeep and has been, but you still have the noise?

Yesterday, I helped a friend rebuild his driveshaft and we uninstalled his skid plate. We drive his Jeep and he had a very difficult time shifting his manual transmission until we reinstalled his skid plate.

I reinstalled my skid plate tonight to see if that fixes my noise. I wasn't able to drive it yet to verify whether the noise is still occurring. I will provide an update this weekend.
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Old 02-10-2012, 12:07 PM   #16
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Excellent, I was able to confirm that putting my skid plat back onto my Jeep fixed the "whirrrr" noises from my transfer case (primarily in the transition between having my foot on the gas and letting it off). This is great! Although, I had adjusted my transfer case linkage with the skid plate off and now, I guess that I have to readjust it back to how it was prior to removing the skid plate, because my gal reports that she had some strange noises when she attempted to put it into 4WD. No problem, easy fix.
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Old 02-12-2012, 04:38 PM   #17
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Skid plate is on and has been on.... i am stumped
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Old 02-12-2012, 05:04 PM   #18
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just a thought

Have those who have the noise checked the fluid level in the Xfr case?
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Old 03-01-2012, 03:37 AM   #19
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I definitely checked all fluids before eventually figuring out that it was my skid plate being uninstalled.
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Old 03-04-2012, 11:13 AM   #20
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Yep all fluids are fine
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Old 08-01-2012, 08:08 AM   #21
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I'm experiencing the same noise exactly as AlaskaTJ has described it. I have my skid plate on and always have. However I recently had the transmission mount replaced. So I wonder if this sound is related to the positioning of the transmission and transfer case in general. Maybe something is not in proper alignment? Did you come to any additional conclusions?
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Old 08-01-2012, 10:07 AM   #22
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My problem was fixed with the reinstallation of the skid plate. I don't know anything about transmission mounts though. It does sound like a possible culprit if there is any chance of messing up the angles. Good luck!
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Old 08-01-2012, 12:09 PM   #23
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Check over your exhaust. The cat may rub the skid at certain RPMs as the whole exhaust system flexs and moves. Check for broken welds around the muffler too. Most of my rattles and whirrrls have been ehaust system related.
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Old 08-02-2012, 08:18 AM   #24
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Gentleman I think we're getting close to finding the dirty culprit. AlaskaTJ's sounds was skid plate related. I suspect mine is transmission mount related AND I just found a broken exhaust mount. Dextreme reminded me of that fact.

I could totally imagine a scenario where when installing the new transmission mount 1) raised the transmission some in comparison to the old one (changing the angle of the drivetrain) and 2) broke the exhaust hanger that attaches to the transmission. I'll get that mount reattached and see if we have a winner.

Thanks guys. I'll let you know if that seems to fix it.

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