regear vibration and some noise - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 21 Old 06-01-2015, 02:06 PM Thread Starter
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regear vibration and some noise

2014 JK 35"x12.5x17 tires 3.5" Rubicon superflex suspension lift. (same shop did all work)


Hey guys since my 4:88 gears went in I am still getting bad vibrations at 55mph up. above 65 isn't a option. It feels like its a back to front vibration. I am kind of lost. the shop that did the work initially pushed a pinion seal spring into the carrier and they were going to be ok with thinking it was a old one, but after they finally took it all apart they found out it was their new spring. They drove it and said the vibration is from higher drive shaft speed, that doesn't make sense to me since before the gearing I could do 90 plus with no vibrations at all. The vibration starts later since they replaced the gears (after the spring incident) but the vibration is stronger.
I'm thinking its the axel but they say thats impossible from what they did to the jeep.

After 65mph it feels like my jeep is going to have catastrophic failure.

Any opinions? Oh and my front pinion seal is leaking.

2014 jk oscar mike edition. Manual. 3.5" Rubicon super flex suspension lift. 35" AT tires 17" method rims. Body armor doors. Smitty built MOD front bumper. Smittybilt 9500 lb winch, ARB twin compressor, Spod with gauge, D2 LED's.
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post #2 of 21 Old 06-01-2015, 02:18 PM
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Take it back ! Take it back ! 4wheel parts ?

SYNERGY, FOX,VKS,HUTCHINSON,
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post #3 of 21 Old 06-01-2015, 02:28 PM Thread Starter
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dont want to say in public, pm'd you

2014 jk oscar mike edition. Manual. 3.5" Rubicon super flex suspension lift. 35" AT tires 17" method rims. Body armor doors. Smitty built MOD front bumper. Smittybilt 9500 lb winch, ARB twin compressor, Spod with gauge, D2 LED's.
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post #4 of 21 Old 06-01-2015, 02:28 PM
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Take it back ! Take it back ! 4wheel parts ?
Winner, winner. chicken dinner.

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If people don't take a stand now,you'll be bitches under their thumbs tomorrow.
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I think too much of a pressure variant between Earth and outer-space... lack of oxygen... something like that.
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post #5 of 21 Old 06-01-2015, 02:30 PM Thread Starter
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They are being butt heads about it...

2014 jk oscar mike edition. Manual. 3.5" Rubicon super flex suspension lift. 35" AT tires 17" method rims. Body armor doors. Smitty built MOD front bumper. Smittybilt 9500 lb winch, ARB twin compressor, Spod with gauge, D2 LED's.
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post #6 of 21 Old 06-01-2015, 02:38 PM Thread Starter
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Dropping it off to them thursday.. I'll give them one last chance to fix it or they can put my stock gears back in and give me back my money.

2014 jk oscar mike edition. Manual. 3.5" Rubicon super flex suspension lift. 35" AT tires 17" method rims. Body armor doors. Smitty built MOD front bumper. Smittybilt 9500 lb winch, ARB twin compressor, Spod with gauge, D2 LED's.
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post #7 of 21 Old 06-01-2015, 02:52 PM
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Dropping it off to them thursday.. I'll give them one last chance to fix it or they can put my stock gears back in and give me back my money.
good luck with that.

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If people don't take a stand now,you'll be bitches under their thumbs tomorrow.
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I think too much of a pressure variant between Earth and outer-space... lack of oxygen... something like that.
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post #8 of 21 Old 06-01-2015, 03:21 PM Thread Starter
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I have no other choice, I cant afford to have it done again by someone else.

2014 jk oscar mike edition. Manual. 3.5" Rubicon super flex suspension lift. 35" AT tires 17" method rims. Body armor doors. Smitty built MOD front bumper. Smittybilt 9500 lb winch, ARB twin compressor, Spod with gauge, D2 LED's.
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post #9 of 21 Old 06-01-2015, 06:53 PM
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Tucson diff seems pretty good maybe they can fix it ?
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post #10 of 21 Old 06-02-2015, 04:57 AM
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that's very common after you gear you need to remember your drive shaft now spins way faster then it did before to drive the exact same speed... because of this usually jks that have to low of front pinion angle which happens when you add caster for handling then you get crazy vibes

want to prove to yourself that its caused by to low of a pinion angle so it vibes remove the front drive shaft and go for a drive..

need more info on the jeep though

what year
auto or stick
how tall is the lift
adjustable arms
aftermarket drive shafts or stock front and back
what size tires


should be a very simple fix but 4wheel is good for buying parts not for installs atleast not in our area haha

2012 JKU, shaved 14/SD60hp locked/spooled, 4 link Front 3 link rear, ORis all around, D3 all over, 42" SX2 tires, 20" Trail ready HD double beadlocks, PSC Full hydro
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post #11 of 21 Old 06-02-2015, 07:48 AM Thread Starter
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2014 6 SPEED MANUAL 3,5 SHORT ARM, 35X12.5X17 TIRES (ACTUALLY 33 3/4") i GET THE WHOLE FASTER AXLE THING BUT THE DAY BEFORE I TOOK IT IN i COULD DRIVE 90 MPD WITH ZERO NOISE OR VIBRATION, BUT NOW iI CAN BARELY DRIVE 65

2014 jk oscar mike edition. Manual. 3.5" Rubicon super flex suspension lift. 35" AT tires 17" method rims. Body armor doors. Smitty built MOD front bumper. Smittybilt 9500 lb winch, ARB twin compressor, Spod with gauge, D2 LED's.
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post #12 of 21 Old 06-02-2015, 07:53 AM
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"remove the front drive shaft and go for a drive"

This.

2009 Silver Unlimited Rubicon -- Not really stock, anymore.
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post #13 of 21 Old 06-02-2015, 08:12 AM
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Have you removed the drive shaft yet ? Same thing we were saying in the other tucson forum, you need to start elminating parts
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post #14 of 21 Old 06-02-2015, 08:16 AM
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Can you snap a pic of your front and rear pinion angles? "Where" is the vibration coming from? Can you feel it in the steering wheel or in the seat of your pants?

It sounds speed depended, which suggests driveline. What's the "noise" you hear? Is it a chugging sound? or a whine? If you knock the t-case into 4-high (in a straight line only) does the noise go away?

It's very hard for a regear to produce vibrations unless they forgot a pinon bearing. Educated guess says you started with 3.21's, which means your pinion is spinning 50% faster than before (3000 rpm at 65mph as to the previous 2000 rpm for DS/pinion speed). If your problems are starting around 55mph now, and get unbearable at 65, they probably would have caused problems at 95+ when on the 3.21's (as that would be the speed required for the same driveshaft speed).

-Mike
2007 2dr X, 6sp, 35's on D44's, 2" lift, cage, hydro, etc.
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post #15 of 21 Old 06-02-2015, 08:55 AM Thread Starter
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I started with 3:73 gears. After they regeared the 1st time it started sooner, they then had to re do rear gears due to them pushing the pinion seal ring into the gears, now it starts later but is worse. Going 90 mph with 3:73 gears stock would be about the same as going 75-80mph with 4:88 35" tires. I start feeling the vibration at about 50mph and gets really bad at 65. Not in steering wheel can feel it in seat and peddle, the noise is kind of a tight noise almost like a hum.

2014 jk oscar mike edition. Manual. 3.5" Rubicon super flex suspension lift. 35" AT tires 17" method rims. Body armor doors. Smitty built MOD front bumper. Smittybilt 9500 lb winch, ARB twin compressor, Spod with gauge, D2 LED's.
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post #16 of 21 Old 06-02-2015, 09:06 AM
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Quote:
Originally Posted by bass5money View Post
I started with 3:73 gears. After they regeared the 1st time it started sooner, they then had to re do rear gears due to them pushing the pinion seal ring into the gears, now it starts later but is worse. Going 90 mph with 3:73 gears stock would be about the same as going 75-80mph with 4:88 35" tires. I start feeling the vibration at about 50mph and gets really bad at 65. Not in steering wheel can feel it in seat and peddle, the noise is kind of a tight noise almost like a hum.
I'd check the entire rear drive shaft for play, especially at the pinion. If all is good, remove the rear driveshaft and try driving front wheel drive. See if the issue goes away.

-Mike
2007 2dr X, 6sp, 35's on D44's, 2" lift, cage, hydro, etc.
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post #17 of 21 Old 06-05-2015, 03:00 PM Thread Starter
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Ok shop looked at the jeep. They said it was the pionion angle in rear, they adjusted it, was balancing a tire and some how ruined it and replaced it with another for free. I better take new apare off rear now and match it with the other new one.
Much better at 60mph in ear now. but still have awefull vibration in front worse then before, lol..

2014 jk oscar mike edition. Manual. 3.5" Rubicon super flex suspension lift. 35" AT tires 17" method rims. Body armor doors. Smitty built MOD front bumper. Smittybilt 9500 lb winch, ARB twin compressor, Spod with gauge, D2 LED's.
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post #18 of 21 Old 08-04-2015, 09:34 AM
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I have the same thing going on with my Jeep. Re-gear to 4.56 and I get a humming frequency around 60-80 mph. Worst is at 70.....right where we drive it the most. Took it in after the break in period for them to re-check everything and out in fresh diff oil. They said it all looks good. Might be tires??? I did ask them about the driveshaft angle but they said they didn't touch anything. Will be getting it back today. Might be doing research myself.

Eric
Rhome,TX

'15 Anvil JKUS
TF 2.5"
Toyo OC 35"
Fuel Revolver 17"
4.56 gearing
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post #19 of 21 Old 08-04-2015, 10:35 AM
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are you guys running stock cv style drive shafts or new u joint upgraded ones?

they don't have to touch anything for it to cause vibes the reason it vibes at that speed is because the drive shaft is now spinning a lot faster then it was before its very basic math

factory well say 3.21 for example reasons... for every single revolution of your tire your drive shaft spins 3.21 times around at any given speed..

now jump to 4.88 and for that same single revolution of a tire the drive shaft spins 4.88 times at any speed the increase in driveshaft speed at 60+ mph can cause it to shake where before it wasn't spinning that fast at 60+mph so you didn't have any vibrations you would of had to hit like 110mph to get the same effect with old gears haha

2012 JKU, shaved 14/SD60hp locked/spooled, 4 link Front 3 link rear, ORis all around, D3 all over, 42" SX2 tires, 20" Trail ready HD double beadlocks, PSC Full hydro
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post #20 of 21 Old 08-06-2015, 01:40 PM Thread Starter
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issue still going on, went from 3:73 to 4:88.. adjusted pinion angle in rear and got a bit better, still need to adjust pinion angle in front but need adjustable control arms to do that.

2014 jk oscar mike edition. Manual. 3.5" Rubicon super flex suspension lift. 35" AT tires 17" method rims. Body armor doors. Smitty built MOD front bumper. Smittybilt 9500 lb winch, ARB twin compressor, Spod with gauge, D2 LED's.
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post #21 of 21 Old 08-22-2015, 11:04 PM
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Are you running new drive shafts than you could at 90mph. could just be a balance issue on a drive shaft. Did you break in the gears properly? My advise is to take it to the best driveline shop in your area and get their assessment, probably not a 4x4 shop, think where a guy with a street racer would go. Gearing is not really a good diy area to install let along diagnose unless you have a lot of experience with replacing drivelines. Without feeling or seeing it, it is gonna be hard to get a real fix since there are multiple variables involved. You are gonna want at least front lower adjustable arms if a 3.5 rubicon super flex is 3.5 inches of lift or more.

2011 Jk 2 door 6 speed. 5.13 gears, 1350 driveshafts, cooper sst+ 35s, warn 9.5, various armor, 1/4 pounder bumper, 12 inch King coil overs, CB, still running the dana 30 sleeved and gusseted up front. Someday wanna go with 1 ton axels but for now I love my JK.
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