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Old 11-04-2013, 10:37 PM   #1
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Driveline vibe

Hey guys I have a 97 TJ Sahara 4.0 5-speed with 186xxx miles. I installed 4.5 lift almost two years ago (roughly 20k miles) along with an Advance Adapters SYE and Tom Woods drive shaft. Just recently I'm getting a bad drive line vibration from 2nd gear on when I am on the throttle, coasting the vibe is gone. I took the driveshaft out and upon inspection the rear ujoint was questionable at best so I had it replaced, however, I am still experiencing the same issue. What else should I be looking for?

Again, coasting there is no vibration, only when on the throttle. Pinion angle is correct and has not changed since install.

Please help!

Thanks in advance,

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Old 11-04-2013, 10:59 PM   #2
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Could check your transmission mounts and/or your engine mounts? Those are easily replaced and can be done without removing the skid plate.

Whens the last time you had your tires balanced ?

Sorry if these are dumb answers. There are too many smart people on this forum that can lead you down a complex expensive rabbit hole. I'd rather start with simple.

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Old 11-04-2013, 11:09 PM   #3
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Could check your transmission mounts and/or your engine mounts? Those are easily replaced and can be done without removing the skid plate. Whens the last time you had your tires balanced ? Sorry if these are dumb answers. There are too many smart people on this forum that can lead you down a complex expensive rabbit hole. I'd rather start with simple.
The tires are about 10k miles on them. It could be that I guess, but I would think I would have coasting as well?

Motor mounts and trans mounts look to be good. I will look into that again though...

Any other thoughts? I'm open to the feed back.
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Old 11-05-2013, 10:41 AM   #4
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Motor mounts and trans mounts look to be good. I will look into that again though...
My guess is your transfer case mount. It can look okay, and still be separated. Put a pry bar between the back of the skid and the tc and gently pry up. If you can raise the tc, replace the mount.
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Old 11-05-2013, 11:20 AM   #5
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Have you greased the CV joint drive shaft properly? I fried mine in less than 20K miles and had it replaced. My shaft didn't come with the grease gun needle attachment needed to get into the recessed grease fitting on the CV joint so I didn't maintain it properly and it cause vibes as it wore out. You can pull the drive shaft and you'll be able to feel if the joint is shot when you work it around in your hands.
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Old 11-05-2013, 04:15 PM   #6
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Have you greased the CV joint drive shaft properly? I fried mine in less than 20K miles and had it replaced. My shaft didn't come with the grease gun needle attachment needed to get into the recessed grease fitting on the CV joint so I didn't maintain it properly and it cause vibes as it wore out. You can pull the drive shaft and you'll be able to feel if the joint is shot when you work it around in your hands.
Are those not replaceable at that point if that be the case?
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Old 11-05-2013, 05:50 PM   #7
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Are those not replaceable at that point if that be the case?
They can be replaced it's called a cv centering kit. Not too difficult to change out just takes time and and a steady hand. If the pin is gaulled or broken it may need to be replaced to. At that point you'll just need weld a new cv to your shaft.
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Old 11-05-2013, 08:59 PM   #8
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They can be replaced it's called a cv centering kit. Not too difficult to change out just takes time and and a steady hand. If the pin is gaulled or broken it may need to be replaced to. At that point you'll just need weld a new cv to your shaft.
Ok thanks for the help. I will pull the shaft out again and check those ujoints at the front of it and go from there.
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Old 11-10-2013, 11:34 AM   #9
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Update for all, it was my CV joint that was causing the vibration. I was able to clean up the joint and pack it full of grease and the vibe is gone (for now, expecting to have to replace it soon).

Thanks for all the help!
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Old 11-10-2013, 11:49 AM   #10
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Good info, thanks for the update.

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