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Old 02-22-2017, 04:26 PM
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Drive Line Vibrations

Hey guys my TJs been acting up recently, when I hit about 30 mph up to 60 mph or so I get vibrations all throughout the jeep. The vibration ranges from a mild shake to a violent one depending on the day, but seems to calm down around 55/60 mph.

1st and 2nd gear don't seem to have any issue but 3rd, 4th, 5th shake like crazy. the shaking stops in 4wd and is non existent when I'm out of gear. RPMs don't seem to affect the vibrations, only speed

This all started last week, but I haven't made any changes recently. This summer I put on a 3.5 inch lift, steering stabilizer, front and rear bumpers but haven't made any other changes since. When I did the lift I had to drop the transmission about an inch with supplied pucks and longer bolts. Immediately after the lift until now there were no noticeable vibrations or other issues.

Fortunately I needed inspection and emissions done anyway so I took it in had it checked out and an alignment. They replaced the track bar, but the vibration is still there, the mechanic and I can't find anything else obviously wrong. Any help would be appreciated.

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Old 02-22-2017, 05:27 PM   #2
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I would check out the transmission mount


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Old 02-22-2017, 06:08 PM   #3
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U-joints or possible pinion angles off, did you install upper adjustable control arms when the lift was put in?
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Old 02-22-2017, 06:47 PM   #4
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Could be that your u-joints have gone bad. I would first attempt to find which driveshaft is giving you trouble. You can take off the rear shaft, put the Jeep in 4wd, and go for a drive. If the shaking stops then it is your rear shaft. If you still have the shakes then reinstall the rear, unbolt the axle side of the front driveshaft and tie it up out of the way securely and go for a drive (in 2wd). Once again, if the vibes stop then it is your front shaft. I would then go through and whichever shaft was giving you problems double check the u-joints and replace any worn ones. If everything looks good it could be that your rear shaft is just at too much of an angle which is causing you vibes that would be fixed with a SYE and double cardan shaft setup.

If for some reason you have vibes and it isn't your driveshafts... I dunno.
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Old 02-22-2017, 07:00 PM   #5
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Have your tires road force balanced first.
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Old 02-22-2017, 10:52 PM
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I would check out the transmission mount


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correct me if Im wrong but the transmission only mounts to the skid plate on a TJ correct?
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Old 02-22-2017, 10:54 PM
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U-joints or possible pinion angles off, did you install upper adjustable control arms when the lift was put in?
Nope my kit only came with lower control arms.

if my pinion angle was off wouldn't it have been an issue from the start?
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Old 02-22-2017, 10:55 PM
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Could be that your u-joints have gone bad. I would first attempt to find which driveshaft is giving you trouble. You can take off the rear shaft, put the Jeep in 4wd, and go for a drive. If the shaking stops then it is your rear shaft. If you still have the shakes then reinstall the rear, unbolt the axle side of the front driveshaft and tie it up out of the way securely and go for a drive (in 2wd). Once again, if the vibes stop then it is your front shaft. I would then go through and whichever shaft was giving you problems double check the u-joints and replace any worn ones. If everything looks good it could be that your rear shaft is just at too much of an angle which is causing you vibes that would be fixed with a SYE and double cardan shaft setup.

If for some reason you have vibes and it isn't your driveshafts... I dunno.
Thanks, I'll look into doing this this weekend
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Old 02-22-2017, 10:56 PM
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Have your tires road force balanced first.
if it were the tires wouldn't I have vibrations when in neutral at the same speeds?
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Old 02-22-2017, 11:31 PM   #10
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correct me if Im wrong but the transmission only mounts to the skid plate on a TJ correct?


Yes sir. The square bushing that bolts to the cross member/skid plate. It wouldn't hurt to just order a new one. Around $30 from Quadratec. Not always the answer to fix driveline vibes, but definitely can do it. Tracking down a vibration is like tracking down a bad idle... Guess and check.




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Old 02-23-2017, 01:14 PM   #11
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if it were the tires wouldn't I have vibrations when in neutral at the same speeds?
Yes, missed that part.
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Old 02-23-2017, 01:52 PM   #12
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Jeepin,

I had the same issues after 2" Pro comp springs where installed, I few guys thought that maybe since my jeep sits higher its putting more strain on my old u-joints, I replaced both rear u-joints and the transmission mount, ended up having to put a TC drop on it to get it to drive normal. I hated doing that, so this weekend I am installing a 1" JKS motor mount lift as well as a JKS 1.25 Body lift. Then I can pull the pucks from my TC skid plate. Hopefully I wont have any vibration issues
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Old 02-23-2017, 02:59 PM   #13
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Normally, a bad transmission mount would show up more under heavy load...1st gear starting out from a dead stop, but be un-noticeable in the higher gears. I think this probably is either a bad u-joint (my guess would be in the rear since it goes away in 4wd), or possibly a bent or out of balance drive shaft. Have you been wheeling it where you could have come down on one of your drive shafts? As mentioned above, i would pull the rear drive shaft and go for a ride in 4wd high and see if there still is a vibe. Check the condition of your rear u-joints while you have the rear shaft out.
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Old 03-01-2017, 03:16 PM
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Thanks for all the insight guys, sorry it took so long for me to get back to you.

Got it all sorted out, turns out it was a bad U-Joint in the rear. Ended up having to take it in and have it done so I had them replace the transmission mount while they were under there.
Thanks again
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