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Old 07-04-2014, 06:34 PM   #1
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2014 JK CV Joint Making noise - Why?/HELP

Background:
2014 JK Sahara 2 Dr - 4,000 miles - 3.5 inch lift/35" tires - Both done by Jeep Dealer before I bought it - Was this way on the lot.

Problem:
Scraping sound/grinding sound - under acceleration or de-acceleration: Feels like the acceleration is being "bound-up" like I'm pulling a 500lbs weight.

Friend said it is the CV Joint (rear drive shaft connects to rear pumpkin)

What causes this part to fail on a new vehicle? Is their an upgrade that will prevent this in the future?

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2014 Oscar Mike Edition 2 Dr. - 4" Lift W/ 35's, 4.88 gears, ARB Lockers Front/Rear, Olympic Front/Rear Bumber with Quadratec 9000 winch, Magellian 7" NAV and back-up camera, Poison spider tramp-stamp/rear tire delete.
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Old 07-04-2014, 07:15 PM   #2
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Bad pinion angle maybe on drive shaft because of lift?

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Old 07-04-2014, 07:18 PM   #3
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Others here can explain more than me though.
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Old 07-04-2014, 07:34 PM   #4
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I would venture maybe the front since anything over a 2.5" or so requires exhaust work around the front drive shaft and some times a new drive shaft.

I bet your front drive shaft is rubbing on the exhaust in the front.
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Old 07-04-2014, 07:38 PM   #5
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Assuming you do not have rear control arms ? 3.5" is pushing the limit of needing pinion correction on a 2 door. Do not drive it like that .. If it fails damage can occur to TC.

Is there any grease splattered around the joint ?
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Old 07-04-2014, 08:57 PM   #6
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Before it started making the horrible noise, I heard a pinging sound - like metal vibrating on the exhaust. Yes there is a little grease splattered on under carriage by rear cv.

So when the dealer fixes it, what modification can I do to make sure this doesn't happen again
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Old 07-04-2014, 09:01 PM   #7
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Your going to need adjustable control arms. At min rear uppers a little longer then stock to raise the pinion angle up.
I asked about caster in the other thread. If you're not sure what you have installed. Snap some pictures.
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Old 07-04-2014, 09:19 PM   #8
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I have the short arms. Standard Rubicon Express lift. I asked about going with longer arms but they said I wouldn't notice much difference in ride.

Can't take pics. Dropped it off at stealership
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Old 07-04-2014, 09:35 PM   #9
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Fixed lowers ? How about uppers ? There's a few different RE lifts. Your rear shaft going is almost certainly a rear pinion issue.

Short/mid arms are fine if adjusted right at that height. Longer (long arms) would indeed make a difference in ride.
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Old 07-07-2014, 05:18 PM   #10
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Update from dealership - help

So the dealership said the rear drive shaft is broken because of the angle to the rear diff.

Remember - 2 dr 3.5" Rubicon Express (basic) lift- That being said, dealership is fixing it under warranty since I bought it that way from the deal....mighty nice of them.

BUT----- What do I need to get/buy/etc... to reduce the angle of the drive shaft. thereby preventing this from happening again???
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2014 Oscar Mike Edition 2 Dr. - 4" Lift W/ 35's, 4.88 gears, ARB Lockers Front/Rear, Olympic Front/Rear Bumber with Quadratec 9000 winch, Magellian 7" NAV and back-up camera, Poison spider tramp-stamp/rear tire delete.
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Old 07-07-2014, 07:03 PM   #11
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Pinion angle needs to be correctly set. Only way to do that is with a minimum of adjustable upper arms to rotate the pinion into place. The better way is with 4 adjustable control arms so that you can get the angle set perfectly and have the axle centered. Only adjustable uppers can tend to push the axle back.

The other thing would be to go to a real double cardan drive shaft as the ones in the JK are not a double cardan(I forget what they are called, but its not technically a double cardan, but close) and have a fairly limited(I want to say I read 16 degrees) amount of travel before binding and damage. An aftermarket double cardan shaft from somebody like om Woods can go to 24 degrees or so(I think thats what Tom Woods told me) before binding. The driveshaft length may not be correct either, might be to short, after setting pinion angle. With an aftermarket shaft you get the proper length out of it too.
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Old 07-07-2014, 07:38 PM   #12
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Yep upper arms will work as long as they adjust down to or close to stock. Lengthened will rotate the pinion up. Yes .. It's ideal to have both uppers and lowers but uppers alone will help prolong the shaft. You may want to look into coil correction wedges as well. Pinion correction can bow the coils depending on the amount or correction ($30) With a double carden style shaft, shoot for the pinion angle 2 degrees less then DS. Stock style (CV/Rzeppa) any correction helps
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Lifting your JK? Read this!!



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Old 07-07-2014, 08:28 PM   #13
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Four wheel parts (they did the work for the dealer originally) have been great. They are going to install new driveshaft from Rubicon express with like A joint set up. I'm also going to upgrade to the long arms. So hopefully that will fix the problem. Thank you for chiming in - your direction help confirm what floor will Parts said the solution should be!! Thank you!!!!
I'll report back after the work is done 😃

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