not good Vibrations after a 2" lift kit - JeepForum.com
 
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post #1 of 10 Old 11-21-2016, 05:57 PM Thread Starter
Submariner
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not good Vibrations after a 2" lift kit

I put a procomp 2" lift on my stock tj, new shocks and springs around. Now I got a vibration in the rear.

I pulled the rear drive line and drove it with the front drive/4wd, no vibrations. I am going to change the u-joints on the drive-line first. they were a little dry and one seems to be a bit stiff.

I was told that I would not have any issues with just a 2" lift.

Any other suggestions on a fix for it?


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post #2 of 10 Old 11-21-2016, 06:05 PM
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MML, lopro, or add a few washers between the TC skid and the frame


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post #3 of 10 Old 11-21-2016, 06:07 PM
Jerry Bransford
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Drivetrain vibrations are common even after a short 2" suspension lift. You just need to decrease the excessive angle at the rear driveshaft u-joints by dropping the transfer case skidplate 1/2" to 5/8" of an inch. You can do that by just stacking enough washers around each of the six bolts between the frame and skidplate until you get that 1/2" to 5/8" drop. The washers will first have to fill up a small indentation so you'll need probably 3/4" worth of washers around each bolt. That means you need to buy about a 4" stack of heavy-duty washers with a 1/2" bolt hole through them.

Loosen but don't remove all six bolts at once. Support the t-case skidplate with a jack and insert the washers on one side first, then do the other. Keeping the bolts in on one side keeps the skidplate from sliding out at an angle.
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post #4 of 10 Old 11-21-2016, 07:22 PM Thread Starter
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That is an easy fix. I will try it tomorrow

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post #5 of 10 Old 11-23-2016, 05:36 AM
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I just did the same thing thanks to jerry's advice and it worked a treat. I would go a little toward the 5/8" side of things, it's easier to just do it once than to not quite get there and have to do the same job again.
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post #6 of 10 Old 11-23-2016, 07:22 AM
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IMO, thats a lot of TC drop for a 2" lift.

also, dont have a jeep with OEM skid with me to verify, but dont the nutserts in the frame fill that small indention on the skid? I'm 90% positive that I only used 2x 1/8" thick washers per bolt on the gf's TC after a zone combo install. naturally that is a different lift and includes a MML, but the spacing between the nutserts and skid remains the same


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post #7 of 10 Old 11-23-2016, 08:08 AM
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First take care of the u joints before you need with anything else.
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post #8 of 10 Old 11-23-2016, 09:01 AM
Jerry Bransford
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Quote:
Originally Posted by Ironhead View Post
IMO, thats a lot of TC drop for a 2" lift.
That's how much it took to get rid of my vibes after installing a 2" suspension lift many years ago. 1/2" to 5/8" of tcase drop has pretty much been the standard recommendation for a 2" budget boost.

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post #9 of 10 Old 11-25-2016, 07:10 AM
toodyaytj
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I figure I gained an 1 1/2" from going from the stock 28's to 31's and then another 2 with the lift so to give up just over 1/2" I'm still almost 3" better off and it stopped the vibration. Thanks again Jerry.
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post #10 of 10 Old 11-25-2016, 09:51 AM
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Quote:
Originally Posted by Jerry Bransford View Post
That's how much it took to get rid of my vibes after installing a 2" suspension lift many years ago. 1/2" to 5/8" of tcase drop has pretty much been the standard recommendation for a 2" budget boost.
Exactly right. I've done many, because I'm poor. All my 4" SL vibes were fixed with a MML and 3/4" t case drop before waiting for my winning lottery ticket to do things the right way............................................... .................................................. .................................................. .................................................. .................................................. .................................................. .................................................. .................................................. .............................

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TheBoogieman is a jerk.
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Originally Posted by mrblaine View Post
Why also would he need a rare as hen's teeth Dana 44 out of another TJ which will eventually lead to him swapping in a POS 8.8 because he can't find one?
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