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Old 08-30-2010, 09:43 AM   #1
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Deep booming pulsating noise under acceleration

Noticed this on my 2004 Wrangler rocky mtn. edition this weekend. Everything is bone stock as far as I know. 30x9.5 yokohama AT wheels on the factory-equipped Alcoa wheels. Automatic, 4.0 motor, has the optional rear-end (Dana 44)

Anyways, I was heading up to a wedding this weekend when I noticed at around 40-50mph, under acceleration there's a noticeably-loud, deep-sounding pulsation. It sounded like it was coming from the middle or maybe SLIGHTLY towards the rear of the car, it was more all-around the interior cabin (has a hardtop). Both me and my buddy thought I had a techno CD in the radio or something, it was a very deep-bass and there was a steady rhythm to these pulses.

I think it might be exhaust-related, as the harder I laid into the gas, the louder it got, and if I let off completely, it went away completely. I understand it could be just some Jeep-noise, since I am brand new to Wranglers. Don't think it's tires, since like I said, it's only when under load. at certain speed ranges (35/40+)

I know I had a camaro z28 previously that had notorious rear-end whining/noises, which was common to all LS1 camaros. Is this pulsating sound a similar "thing" for Jeeps? Anybody else experience this?

I can always take it back to Carmax for any issues in the first 30 days, but anyone have any similar sounds, is it common to all TJ's?

Thanks! Just wondering out loud here.

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Old 08-30-2010, 09:46 AM   #2
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That sounds like it could be a bad driveshaft u-joint.

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Old 08-30-2010, 09:47 AM   #3
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Quote:
Originally Posted by redbandit View Post
Noticed this on my 2004 Wrangler rocky mtn. edition this weekend. Everything is bone stock as far as I know. 30x9.5 yokohama AT tires on the factory-equipped Alcoa wheels. Automatic, 4.0 motor, has the optional rear-end (Dana 44)that was standard with the Rocky Mtn. Package.
Fixed.

First thing I would do is check the transmission mount.
Then U-joints.
Then take it back to Carmax and have them fix it.
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Old 08-30-2010, 10:34 AM   #4
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Quote:
Originally Posted by distortedtj View Post
Fixed.

First thing I would do is check the transmission mount.
Then U-joints.
Then take it back to Carmax and have them fix it.
Ohhh, cool, another neat feature of the package then!

Ok, so I am checking the t-mount and u-joints for what exactly? I just saw a jeep-parts diagram so i can see where they are, but what would I be checking for? Jeep noob! Be gentle!
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Old 08-30-2010, 10:39 AM   #5
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U-joints....grab the drive shaft and turn it..."use your man hands' and watch for any play in the joints....check to make sure the caps are not worn and moving.

Trans mount....put a jack under the transmission and jack it up gentle "front of t-case skid"...from the rear of the t-case skid look at the trans mount "bolted between the t-case skid and the trans/tcase" make sure the rubber is not separating.
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Old 08-30-2010, 11:47 AM   #6
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Quote:
Originally Posted by distortedtj View Post
U-joints....grab the drive shaft and turn it..."use your man hands' and watch for any play in the joints....check to make sure the caps are not worn and moving.

Trans mount....put a jack under the transmission and jack it up gentle "front of t-case skid"...from the rear of the t-case skid look at the trans mount "bolted between the t-case skid and the trans/tcase" make sure the rubber is not separating.
Ok cool I'll give her a shot when i get home. i think i get what you mean on the trans diagnostic...

hell, while I have the privileges, might just take it to Carmax and say "fix it"

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