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Old 03-21-2016, 08:01 AM
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Humming/Growling Deceleration

Hey all

My 99 TJ Sahara makes a low grow/hum when i take my foot off the gas in gear. its most noticeable around 20-40 mph. No certain gear. At first i thought it was coming from behind the dash like in heater core area but ive changed that to somehwere under the floorboard/engine/transmission. the sound is like im driving on 35" tires- that loud low humm. As soon as i accelerate any, it goes away. I have researched online but havnt found a solution. Anybody know? pinion bearing? transmission? ideas?

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Old 03-21-2016, 10:13 AM   #2
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This may have nothing to do with your issue, but I once had a set of tires that did that on my stock F-150. I was sure I was losing a bearing somewhere, but it turned out to be the tires. They still had about 70% of the tread left on them, so I was really surprised they started making that awful growling bearing type noise. You might try rotating them from left side to right side so they rotate in the opposite direction to see if that effects your noise.

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Old 03-21-2016, 10:44 AM   #3
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It might just be your exhaust. Try running up the rpms a little bit then letting off the gas. If it's noticeably louder the higher the rpms then it's just what I call exhaust cackle.
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Old 03-21-2016, 10:57 AM   #4
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Start with the basics first. It would be helpful if you can post a video. Have you checked the u-joints for play, transmission, front and rear differential levels? Hard to pinpoint from your explanation so start here and check back.
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Old 03-21-2016, 12:49 PM
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Just took a video. I'll have to figure out how to post. But I did check u joints for play. They appeared fine.

I've checked a few things. It is weird it sounds just like loud tires but doesn't appear to be coming from there. I do have an exhaust leak coming from muffler to tail pipe. The weld broke loose so it just sits in the muffler. But it doesn't sound like exhaust. I could be wrong.
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Old 03-21-2016, 01:24 PM   #6
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Just took a video. I'll have to figure out how to post. But I did check u joints for play. They appeared fine.

I've checked a few things. It is weird it sounds just like loud tires but doesn't appear to be coming from there. I do have an exhaust leak coming from muffler to tail pipe. The weld broke loose so it just sits in the muffler. But it doesn't sound like exhaust. I could be wrong.

It could be the exhaust. Look forward to the video.
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Old 03-21-2016, 01:56 PM
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Video. U can here on deceleration
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Old 03-21-2016, 02:01 PM
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Old 03-21-2016, 02:33 PM   #9
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Maybe its me but I cant hear anything on that video. I did notice however a yellow light flash in the top right corner of your dash. Is that washer fluid or something else?
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Old 03-21-2016, 02:37 PM
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Shift light. You can here it towards the middle of video when rpm drop
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Old 03-21-2016, 04:55 PM   #11
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I wrestled with a speed sensitive roar just like that. I could have sworn it was my exhaust. Did all the normal validations of u joints, etc. After a few months it finally became more noticable when I would turn my wheel slightly to the left - wheel bearing.

It was a pretty easy garage floor repair. 3 star bolts on the back of the knuckle and then a big cheat bar to break the hub nut loose. Plenty of videos on you tube if you do find this is your issue.
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Old 03-21-2016, 05:53 PM   #12
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Mcobb, you should fill out your profile so we know where you are. If you're nearby, I can give you a hand diagnosing and fixing.
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Old 03-21-2016, 05:55 PM
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I was thinking wheel bearing too but it completely goes away when I apply gas.

Sorry I will update profile now.
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Old 03-21-2016, 05:57 PM
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But until then. I'm in Middletown ohio
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Old 03-21-2016, 06:19 PM
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I wrestled with a speed sensitive roar just like that. I could have sworn it was my exhaust. Did all the normal validations of u joints, etc. After a few months it finally became more noticable when I would turn my wheel slightly to the left - wheel bearing. It was a pretty easy garage floor repair. 3 star bolts on the back of the knuckle and then a big cheat bar to break the hub nut loose. Plenty of videos on you tube if you do find this is your issue.
are wheel bearings for 99 a one piece hub assembly?
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Old 03-21-2016, 06:27 PM   #16
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A good way to listen for a wheel bearing is to find a stretch of road or big parking lot and roll down all windows. Turn hard to one side and back to the other. You can hear it much better this way. Once you pinpoint right or left side. If it is a wheel bearing my first guess would be right front
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Old 03-21-2016, 07:00 PM
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A good way to listen for a wheel bearing is to find a stretch of road or big parking lot and roll down all windows. Turn hard to one side and back to the other. You can hear it much better this way. Once you pinpoint right or left side. If it is a wheel bearing my first guess would be right front
Yeah I checked the tire for play when I jacked up the front but didnt have any so I ruled that out.
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Old 03-21-2016, 07:41 PM   #18
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Yeah I checked the tire for play when I jacked up the front but didnt have any so I ruled that out.

A wheel bearing is hard to diagnose for play unless its totally wiped out. Jack and spin each wheel and listen. Also as I suggested earlier have you checked all your fluid levels? Front and rear diffs, transmission and transfer case?
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Old 03-21-2016, 09:38 PM   #19
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did you check the Yoke nut? maybe over time it backed it self off?
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Old 03-22-2016, 08:11 AM
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i am still trying to figure out all the front suspension/steering parts. When i first owned a jeep i didnt pay much attention to it and im trying to make sence of it all lol. Almost every zerk grease fitting on any front suspension part has grease all over that part so i may need to start replacing/regreasing.
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Old 03-23-2016, 07:15 AM   #21
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Hey all

My 99 TJ Sahara makes a low grow/hum when i take my foot off the gas in gear.......... pinion bearing?
Mine did too. take a close look at the spider gears when you open things up.
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Old 03-23-2016, 07:56 AM
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Mine did too. take a close look at the spider gears when you open things up.

In the front diff?


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Old 03-23-2016, 08:11 AM
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its just strange that it stops when i apply the clutch or accelerate
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Old 03-23-2016, 09:11 AM   #24
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that's because you are changing the input load on the bearing.

before I had an overhaul done on the rear diff I thought the transmission was problematic also but the noise was from the rear diff.
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Old 03-23-2016, 10:15 AM   #25
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are wheel bearings for 99 a one piece hub assembly?
Yes, it's a complete assembly. I believe i purchased a Timken assembly. Just to make life more interesting be aware that the 99 Wrangler was a change - over year on the wheel bearings. If you determine you need to replace one take it off and take it to the store with you. My Jeep has a 98 hub on the driver side and a 99 hub on the passenger side. That was a fun problem to diagnose!
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Old 03-23-2016, 03:56 PM
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that's because you are changing the input load on the bearing.

before I had an overhaul done on the rear diff I thought the transmission was problematic also but the noise was from the rear diff.

After listening to it again. It could be coming from rear end. Just curious- will these gears completely strip out eventually or do I have some time. In going out of town this weekend and won't get to look at it before.


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Old 03-23-2016, 05:21 PM   #27
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After listening to it again. It could be coming from rear end. Just curious- will these gears completely strip out eventually or do I have some time. In going out of town this weekend and won't get to look at it before.
Driveline components are built very well and can last a long time if taken care of and not abused; they don't usually catastrophically fail unless put through very stressful situations. I'd check all the fluids and make sure levels are good for everything, maybe even replace the fluids, and do my best to ignore the noise while on my trip. Hell, swapping out all the fluids may even make the noise go away... That's what I would do.
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Old 03-23-2016, 05:23 PM
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Driveline components are built very well and can last a long time if taken care of and not abused; they don't usually catastrophically fail unless put through very stressful situations. I'd check all the fluids and make sure levels are good for everything, maybe even replace the fluids, and do my best to ignore the noise while on my trip. Hell, swapping out all the fluids may even make the noise go away... That's what I would do.

That was my thinking and what I shall do! Lol I have a disorder where if I hear /smell/ feel anything strange on my vehicles I must know what it is. And fix lol.


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Old 03-23-2016, 06:07 PM   #29
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I was talking with a buddy the other day, and he was wondering why all the xj's at pic-n-pull had the d35 covers pulled, and carriers gone. I said look on the ground, the carriers will be laying, and the spiders gone. He said sure nuff next time he went by there that was exactly the case.
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Old 03-23-2016, 06:09 PM
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I was talking with a buddy the other day, and he was wondering why all the xj's at pic-n-pull had the d35 covers pulled, and carriers gone. I said look on the ground, the carriers will be laying, and the spiders gone. He said sure nuff next time he went by there that was exactly the case.

Lol damn. Didn't know they really had that big of an issue with them.


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