Vibration after gear install - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 19 Old 02-01-2012, 12:58 PM Thread Starter
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Vibration after gear install

What would cause a vibration after a gear install job?

The gears don't whine. They make very little noise. If you weren't specifically listening for it, you'd never even hear it. So I am assuming that they are meshed up pretty well. We did also use the marking compound and check the pattern and it looked OK. All I know is that ever since the gear install, I've got a vibration on the highway. Nothing else was changed.. only the ring gears, pinion gears, and seals. Bearings looked great and only had 11K miles on them so were reused. Fluid has been changed twice with GL-5 80W90. All driveshaft bolts are tight.

Any ideas?

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post #2 of 19 Old 02-01-2012, 01:02 PM
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Majority of the time is gonna be a DL vibe. After doing gears your DL's are spinning quite a bit faster. Make sure your pinion angles are setup, it'll fix your problem.

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post #3 of 19 Old 02-01-2012, 01:34 PM
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You could try pulling the front driveshaft off and going for a drive to help diagnose it.
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post #4 of 19 Old 02-01-2012, 02:39 PM
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The same thing happend to me on my 80 series Land Cruiser and I gave up trying to figure it out. I pulled driveshafts and balanced tires and replaced u-joints.

I know that dosen't help but if you had a shop install them, eliminate what you can so that they see you have tried to figure it out. If you run out of options then they should tear it down and check the clearances or there could be a manufacturing error in the ring or pinion.

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post #5 of 19 Old 02-01-2012, 03:31 PM
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Same thing happened to me when I went from 4.11s to 5.38s. The driveshafts were spinning faster. The front was marginal before, but I did not notice any vibration. I drove with the driveshaft out and the vibes went away. Put it back in and they came back. A new driveshaft took care of the problem. Old one had slop in the splines and CV joint.

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post #6 of 19 Old 02-01-2012, 04:55 PM Thread Starter
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Well I tried to remove the front driveshaft tonight and no dice. Even with 130psi on my impact gun, the bolts at the front U-joint won't budge. It's freaking ridiculous. Going to have to find someone with a bigger compressor.



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post #7 of 19 Old 02-03-2012, 05:18 AM Thread Starter
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Finally got the front shaft out. Took it for a drive and the vibes are still there.

Sigh.. I'm afraid this is going to turn into a goose chase. I guess the next step is to check the rear shaft.

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post #8 of 19 Old 02-07-2012, 11:27 AM Thread Starter
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So when you guys remove your rear yoke, how did you do it? Did you tap it out with a hammer? Or did you rent a puller tool? I'm wondering if there's an outside chance I could have slightly bent the yoke when I used the hammer to knock it loose.

Other possible thing is the rear brake shoes. They did get jostled around when I pulled the axle shafts. Maybe the adjustment on them got tweaked?

This just makes no sense. Guess I'll pull my rear shaft and drive in 4-high and see if the vibes go away and then go from there.

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post #9 of 19 Old 02-09-2012, 08:04 PM
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I too had a hell of a time disconnecting from the pinion yoke.

The shaft was toast so I took a hammer and abused the soft end of a screwdriver prying it out

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post #10 of 19 Old 02-10-2012, 05:59 AM Thread Starter
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Update: I pulled the rear shaft and jacked up the rear tires and when I spin them while my hand is on the yoke, I can feel roughness in the pinion bearings. SHIT. So tonight I have to take the entire rear end apart and set the gears up all over again with new bearings. I'm 75% sure that's where my vibes are coming from. Damn these JKs are finnicky. My YJ/ZJ/KJs never gave a crap what you did to them, they just ran like sewing machines.

JK going under the knife again.. . wish me luck.

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post #11 of 19 Old 02-11-2012, 10:57 AM Thread Starter
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OK so we went through the entire rear end again. Installed the pinion gear with new bearings, new seal, and new crush sleeve. Got it perfect with no play and a good preload setting. Then installed the carrier and played with the shimming on it until we got it to .005" backlash with cold gear oil. Once the gearset wears in and gets a little age on it, and the gear oil warms up (it's 20 degrees outside today) the backlash should be setting in that perfect .005 to .010" range. Got the yellow dot on the rear driveshaft lined up with the yellow dot on the rear yoke. Brakes are looking great with little wear and no drag at 12,000 miles now. Everything is perfect, right?

Went out for a test drive.. still have a little vibration. It may not be quite as bad as before, but it's still there. These damn JKs are the most finnicky 4x4s I've ever seen.

BUT... at this point I think it's good enough to live with. The driveshafts must hate spinning any faster than stock, and I'm not willing to sink any more cash into this thing yet. So I'm going to drive it and love it now.

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post #12 of 19 Old 02-11-2012, 12:50 PM
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I had a similar issue.. did you make sure your rear drive shaft is balanced again?

Current project jeep 08' wrangler 2dr
Past jeep:
- 07' Rubicon 4 dr, RAMICON- 3.5" ROCK KRAWLER Coil-Over lift
- 5.38 gears- Gusseted/Trussed/inner sleeved
- 40" Pro Comp X-Terrain

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post #13 of 19 Old 02-11-2012, 07:24 PM
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I guess there's a chance you could have bent the yoke...
And for all the rookie gear installers, the easiest way to remove a pinion yoke
is push the pinion out once the carrier is removed.
If you take a look most pinion gears have a dimple in the center,
leave the nut on a bit as not to wreck the threads on the pinion.
It's nice to have a air hammer but a good sized punch works with a hammer.
When setting pinion depth you may need to pull the yoke 2-3....times.
And if you dont have a air hammer, a 3rd hand will come in handy or the pinion
may go for a flight with a crash landing.
So dont beat on the yoke, push the pinion out!
And oh, put a little oil on the pinion splines so the yoke will slide off & on easier while setting depth.

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Last edited by GT500; 02-11-2012 at 07:34 PM.
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post #14 of 19 Old 02-14-2012, 08:23 AM Thread Starter
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Quote:
Originally Posted by fourplyn View Post
I had a similar issue.. did you make sure your rear drive shaft is balanced again?
No, I haven't had the rear shaft balanced yet. That's my next step. I found a place about 20 miles away that balances shafts for around $75 bucks. When the weather breaks I'll try to get that done.

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post #15 of 19 Old 02-14-2012, 10:19 AM
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Try setting your dial indicator on the back side of the yoke.

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post #16 of 19 Old 02-14-2012, 04:41 PM Thread Starter
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Is there any possibility that the ESC system could be causing this vibration and steering wheel shimmy?

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post #17 of 19 Old 02-15-2012, 08:29 AM Thread Starter
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Well today I visited a reputable shop that deals with truck drivelines on a daily basis. They said there is no way they can balance my rear shaft because it's got CV joints at both ends, and they don't have a machine that can bolt to those type of joints.

So.. I'm screwed there.

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post #18 of 19 Old 02-15-2012, 11:51 AM Thread Starter
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Quote:
Originally Posted by GT500 View Post
Try setting your dial indicator on the back side of the yoke.
Yeah, that's the next thing I'm going to be looking at now is the yoke.

Problem is, I can't find a listing for JK pinion yokes anywhere! Everything I'm seeing is the strap and bolt U-joint style flanges. I can't find the CV style yokes online at all.

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post #19 of 19 Old 03-05-2012, 08:04 AM Thread Starter
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Checked the rear shaft again and flange, no change. The more I chase this problem, the more I believe that BOTH of my factory driveshafts are a little out of balance. UGH. I actually did notice some "rumble strip" vibes when the Jeep was brand new. Now with the gearing it's a lot worse. If it's both shafts, this would make sense.

Technically, this should be covered under warranty since I didn't alter the shafts at all. But I'm sure they'd fight me on it since it's been regeared. This just sucks.

At 70 it's so bad that I don't even want to drive it that fast. I'm afriad of the vibes eating the bearings for breakfast.

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