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post #1 of 9 (permalink) Old 10-17-2019, 09:50 PM Thread Starter
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Vibration above 70mph

I'm trying to track down a high speed vibration. Does anyone have a recommendation for a drive line shop in Washington state? Also does anyone know what the correct driveline length is for the 5.7 with QDII is? I've replaced virtually the entire drive train except the rear drive line transmission and transfer case.
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post #2 of 9 (permalink) Old 10-17-2019, 10:30 PM
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Quote:
Originally Posted by Jmac509 View Post
I'm trying to track down a high speed vibration. Does anyone have a recommendation for a drive line shop in Washington state? Also does anyone know what the correct driveline length is for the 5.7 with QDII is? I've replaced virtually the entire drive train except the rear drive line transmission and transfer case.
Have you had the tires balanced?

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post #3 of 9 (permalink) Old 10-18-2019, 12:59 AM Thread Starter
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I've had them road force balanced multiple times with no changes in the vibration
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post #4 of 9 (permalink) Old 10-18-2019, 02:32 AM
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It could be many things - unblanced tires, bent wheels, sticking brake (also e brake), or what i recently saw on youtube it also can be a grease build up in your rear driveshaft (
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post #5 of 9 (permalink) Old 10-18-2019, 11:46 AM
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front length for rzeppa drive shaft 34.75" flange to flange on mine. not sure of the rear...with ujoints is much more durable IMO than the rzeppa front.
if you have a front with 2 rzeppa CVs, id take another look at it. and check the front diff isolator from the front cover to the frame too. if you have an aftermarket poly bushings, then you will have more vibrations as well...

and you replaced both front CV axles too? how do the output shafts of the xfer case feel with driveshafts off? any play?


and you replaced wheel bearings too? front and rear or they are ok?



have you swapped tires/wheels around to see if the vibration moves? newer tires? or some with wear?



did you take it to the same place to get balanced? if so, get a second opinion...
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post #6 of 9 (permalink) Old 10-18-2019, 11:47 AM
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Drivelines Northwest I have used multiple times over the last 20 years and they are excellent! They have multiple locations I believe.

Where do you "feel" this vibration? Steering wheel? seat? arm rest? any noise or just vibration? Does it go away above or below specific speed? You are certain it isn't the road I assume? Does it change with engine speed or car speed?

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post #7 of 9 (permalink) Old 10-18-2019, 03:48 PM Thread Starter
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The vibration at around 70 starts with shaking the seats and by 80 it gets pretty intense rattling the entire dash board. At 65mph it's smooth as glass, zero noise or viberation. It's definitely drive train related because it only occurs on the gas especially under load going up a hill.

All the bushings and mounts have been changed, both cv joints are new front drive shaft is new. Both wheel bearings up front are new. The rear wheel bearings I'm not sure if they're new but I just had the rear differential rebuilt and I assume the shop looked at the condition of the bearings since I was trying to track down a buzzing noise. I've had the tires balanced multiple times at mutlieple different places with no changes. The output shafts on the t case feel tight and the shop said they thought the case was good. The front driveshaft was pretty rough when I pulled it so the only thing I can assume is it's the rear driveline.

Last edited by Jmac509; 10-18-2019 at 03:50 PM.
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post #8 of 9 (permalink) Old 10-18-2019, 06:24 PM
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I am not an expert on these specific vehicles yet so take what I am going to say with that in mind. If sounds like a front driveshaft or front suspension bushings/angles/etc, definitely not tires/wheels/wheel bearings etc. Doesn't sound like a rear driveshaft either but it is pretty easy to pull it and have it balanced just to make sure.

Is the Jeep lifted? When was it last aligned? After all of the bushings and front suspension work?
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post #9 of 9 (permalink) Old 10-19-2019, 12:51 AM
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Quote:
Originally Posted by Jmac509 View Post
The vibration at around 70 starts with shaking the seats and by 80 it gets pretty intense rattling the entire dash board. At 65mph it's smooth as glass, zero noise or viberation. It's definitely drive train related because it only occurs on the gas especially under load going up a hill.

All the bushings and mounts have been changed, both cv joints are new front drive shaft is new. Both wheel bearings up front are new. The rear wheel bearings I'm not sure if they're new but I just had the rear differential rebuilt and I assume the shop looked at the condition of the bearings since I was trying to track down a buzzing noise. I've had the tires balanced multiple times at mutlieple different places with no changes. The output shafts on the t case feel tight and the shop said they thought the case was good. The front driveshaft was pretty rough when I pulled it so the only thing I can assume is it's the rear driveline.
I just recently had a very similar problem. Above 60mph any acceleration or load, and it felt like something was going to fly apart. In m y case it was because I changed my front drive shaft. I was (and still hope to) replacing the stock rzeppa on both ends, with a u joint Double Cardan. Tried a couple of different versions. The shop could find no balance or joint problems with the shafts. I reinstalled my stock shaft and there is no vibration. You my consider re-replacing your front shaft. Mine is a 2010 Hemi QD2 with the double ended rzeppa CVs, it measures 35 5/8" flange face to flange face.
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