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Old 05-13-2017, 10:12 PM
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Help vibration problem

So I get a vibration in the front around 54 to 60 mph, this immediately after getting regeared to 4.88. Installer says can't be gears, he drove it and said possible something that was already there around 75 or so and just manifested itself at 54 because of the new gears. So I suspect maybe driveline. I indexed driveline 180 degrees, no good. had tires roadforce balanced, still no fix. took to dealer to troubleshoot. they repaired leaking oil pan, replaced leaking rear axle seal, bearing and retaining ring, and leaking rear pinion seal, rebalanced my tires again, and aligned. Still no vibration fix. So I remove front driveshaft, helped some but definitely still have vibs. So since the dealer replaced pinion seal just two months after new seal install with gears I look over the pinion. Found I can move the pinion a little bit up and down and side to side, makes slight clunking noise. Check front pinion and there is no up an down or side to side slop.

Two questions
1. Is this side to side and up and down movement in the rear pinion natural?
2. Is it possible I have a problem in my rear gearing but causes me to feel a vibration that seems to come from the front, I can even feel it in my steering wheel, feels harmonical.

Thanks for any help you can give me on this, I want my smooth driving Jeep back

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Old 05-14-2017, 08:03 AM   #2
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So I get a vibration in the front around 54 to 60 mph, this immediately after getting regeared to 4.88. Installer says can't be gears, he drove it and said possible something that was already there around 75 or so and just manifested itself at 54 because of the new gears. So I suspect maybe driveline. I indexed driveline 180 degrees, no good. had tires roadforce balanced, still no fix. took to dealer to troubleshoot. they repaired leaking oil pan, replaced leaking rear axle seal, bearing and retaining ring, and leaking rear pinion seal, rebalanced my tires again, and aligned. Still no vibration fix. So I remove front driveshaft, helped some but definitely still have vibs. So since the dealer replaced pinion seal just two months after new seal install with gears I look over the pinion. Found I can move the pinion a little bit up and down and side to side, makes slight clunking noise. Check front pinion and there is no up an down or side to side slop.

Two questions
1. Is this side to side and up and down movement in the rear pinion natural?
2. Is it possible I have a problem in my rear gearing but causes me to feel a vibration that seems to come from the front, I can even feel it in my steering wheel, feels harmonical.

Thanks for any help you can give me on this, I want my smooth driving Jeep back
The pinion will rotate a bit, this is due to the gear lash but should never move up and down or side to side. If the pinion is moving in that way take it back to your gear installer.

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Old 05-15-2017, 08:28 AM
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Oh Joy, my gear installer is blaming the dealer for screwing up the preload. sigh
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Old 05-15-2017, 08:51 AM   #4
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The pinion will rotate a bit, this is due to the gear lash but should never move up and down or side to side. If the pinion is moving in that way take it back to your gear installer.
Less than 20 thou of radial (side to side or up and down) play is generally OK in yokes on semi trucks, less than 15 is better. I wonder if the spec is much different for our axles. Probably a little less tolerance if I had to guess. There should really be no perceivable axial (in/out) play. I might be able to find this exact info at the company I work for. If I do, I will post back.

You would need an adjustable magnetic base dial indicator to read it accurately, and to have the driveshaft disconnected.

Hand reading the play only gets you so far. Could be any number of things really.

I had something similar going on, harmonically at that speed. Got the front shaft trued and rebalanced, it got better. Swapped tires for used 37 MT/R's, now I can't feel or hear a thing, since they are such a pain and so loud, ha ha. Problem solved.

In all honesty it was probably front shaft plus tires in combination together that were the cause for me. I am sure yours will be different.
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Old 05-15-2017, 08:59 AM
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I got the front shaft pulled now
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Old 05-15-2017, 09:06 AM   #6
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I got the front shaft pulled now
I did the same and it only seemed a little better. Can you describe what is going on with the "incorrect preload" issue on the pinion per the shop?

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Old 05-15-2017, 10:40 AM
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The shop guy hasn't looked at it yet, I took it there this morning. Last week I took it to the dealer to try to find the source of the vibration and they couldn't find the source (they say it's probably the tires) but they did find a leaking pinion seal and axle seal, and they replaced both. I crawled under there Saturday to remove the front shaft and while I was there I checked the back pinion and found play in it. So I tell my gear guy that and he says if it's loose the guys at the dealer screwed up while changing the seal. So I say if we didn't have a problem here to start with the seal wouldn't have been leaking. He does a lot of gears and is adamant that when a vehicle leaves his shop the gears are right. He is the only one that sets the gears, the other guys just do r&r. He did agree to look at it.

So I got weird deal going on. I understand that a dealer can void a warranty because of a mod but this is a gear shop that now seems to want to void their warranty because a dealer worked on it.
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Old 05-16-2017, 12:34 PM
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My shop guy thinks its the rear driveshaft causing the vibs. He wants to build me a new one, he doesn't like pancake shaft ends
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Old 05-18-2017, 12:56 PM
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New driveshaft didn't fix it. He says pinion yoke is wobbling, he wants to swap pinion yokes.
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Old 05-18-2017, 01:20 PM
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I asked if pinion could be bent he says no it would create a tight spot on the ring gear
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Old 05-26-2017, 07:31 AM
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Problem fixed, yea, It was a bent pinion yoke, what a frustrating time. So it either got bent during the gear change or it was bad all the time but I never ran that high of driveshaft speed before the change, It seems I did have a vibration around 75-80 before the change. Anyhow I'm now vibration free to 80mph!!!!
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Old 10-01-2018, 08:51 PM   #12
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Jedi9, I know how you feel. Glad it's fixed.Unfortunately, I still have same issue. I re-geared twice first with G2 4:88 then REVOLUTION 4:88. 3 sets of drive shafts later and still no fix (currently MC 1310 front / ADAMS 1350 rear). I had perfectly smooth jeep rubicon recon then spent the dough to make it my own Frankenstein. I put mc game changer 3.5, yeti steer smart hi steer system, Toyo open country 35 mt which i ( changed to BFG K02 all terrain) Hoping it was tires. Frustrated.
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Old 10-02-2018, 01:26 AM   #13
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Jedi9, I know how you feel. Glad it's fixed.Unfortunately, I still have same issue. I re-geared twice first with G2 4:88 then REVOLUTION 4:88. 3 sets of drive shafts later and still no fix (currently MC 1310 front / ADAMS 1350 rear). I had perfectly smooth jeep rubicon recon then spent the dough to make it my own Frankenstein. I put mc game changer 3.5, yeti steer smart hi steer system, Toyo open country 35 mt which i ( changed to BFG K02 all terrain) Hoping it was tires. Frustrated.
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Old 10-02-2018, 11:16 AM   #14
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Problem fixed, yea, It was a bent pinion yoke, what a frustrating time. So it either got bent during the gear change or it was bad all the time but I never ran that high of driveshaft speed before the change, It seems I did have a vibration around 75-80 before the change. Anyhow I'm now vibration free to 80mph!!!!
I had the same problem; bad rear pinion yoke.
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Old 10-02-2018, 11:17 AM   #15
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Jedi9, I know how you feel. Glad it's fixed.Unfortunately, I still have same issue. I re-geared twice first with G2 4:88 then REVOLUTION 4:88. 3 sets of drive shafts later and still no fix (currently MC 1310 front / ADAMS 1350 rear). I had perfectly smooth jeep rubicon recon then spent the dough to make it my own Frankenstein. I put mc game changer 3.5, yeti steer smart hi steer system, Toyo open country 35 mt which i ( changed to BFG K02 all terrain) Hoping it was tires. Frustrated.
What control arms do you have?
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Old 10-03-2018, 08:19 PM   #16
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metal cloak
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Old 10-03-2018, 08:21 PM   #17
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Old 10-04-2018, 11:32 AM   #18
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metal cloak
Have you re torqued everything? Track bars, control arms, steering etc.

Vibrations and jeeps, seem to go together like white on rice. (So i've unfortunately learned) I'm in the same boat as you, except I think I have it tracked down to bum control arms. I have new Metalcloak on the way.
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Old 10-05-2018, 12:17 AM   #19
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thank you, love the metalcloak...You will too. Unfortunately, I have had several mechanics under the jeep skirt if you will. So, I have no idea what is loose,tight or perfect. I am a low voltage cctv, security guy..not a mechanic. So I rely on them. I will hopefully figure it out soon before my wind goes out of my sails.
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