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Old 06-19-2014, 11:03 PM
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Slip Yoke Vibrations

Just installed an Advance Adapters slip yoke eliminator with a Tom Woods Rear CV Driveshaft and loving the difference in shifting again, but now I'm having some minor vibrations when I'm in 3rd and 4th gear. They seem to die out by the time i hit 45mph. Any ideas what may be causing it/is it even an issue?

2001 TJ manual 4.0L
4in Skyjacker lift

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Old 06-20-2014, 03:19 AM   #2
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You sure you got your rear pinion angle set up correctly? I assume you have adjustable rear control arms?

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Old 06-20-2014, 12:25 PM
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No I did not check the pinion angle, and still have stock upper control arms. Gonna go get an angle finder, and I guess have to order some adjustable upper control arms.

Any suggestions on a good brand?
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Old 06-20-2014, 01:51 PM   #4
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Currie or Metalcloak. Your pinion should be pointed directly at the back of the transfer case with a sye.
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Old 06-20-2014, 03:16 PM   #5
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Quote:
Originally Posted by Hawkeye18 View Post
No I did not check the pinion angle, and still have stock upper control arms. Gonna go get an angle finder, and I guess have to order some adjustable upper control arms.

Any suggestions on a good brand?
Agreed. Got to get that pinion angle dialed in.

Brands...Rokmen, Currie/Savvy with REAL Johnny Joints (not cheap Flex joints), or the new Metalcloak Duraflex arms.

I have replaced my Flex Joint inerds a couple times after failure. Should of spent more the first time.

Double adjustabe at least for the uppers will make adjusting your pinion angle much easier without having to remove an end each time.
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Old 06-21-2014, 11:13 AM
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Ok I ordered some uppers, in the meantime is it safe to drive a limited amount on it as is, or should I just garage it until I can get it fixed?
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Old 06-21-2014, 04:55 PM   #7
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Ok I ordered some uppers, in the meantime is it safe to drive a limited amount on it as is, or should I just garage it until I can get it fixed?
Vibrations are never good. They can damage seals and bearings. If you don't have to drive it, I wouldn't. If you do, take it easy on the gas pedal, and keep the speed down. Will it hurt it?? It all depends on the severity of the vibes and how long you drive it that way.
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Old 06-23-2014, 12:38 PM
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I measured the angles, pinion is sitting at about 10* driveshaft at 21*. Is that sort of difference easily corrected with the adjustable UCAs?
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Old 06-23-2014, 01:03 PM   #9
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I measured the angles, pinion is sitting at about 10* driveshaft at 21*. Is that sort of difference easily corrected with the adjustable UCAs?
Yes, as your pinion angle increases, your drive shaft angle decreases, so they'll meet in the middle...you're basically talking about moving it around half that amount. You should also have an angled track bar bracket on your axle so you don't bind the track bar bushing.
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Old 06-23-2014, 03:50 PM   #10
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The correct working angle is 1-4 difference. I just set mine today. I added 2" spacer to the rear springs to level out my ride height. That gave me working angle of 1 on the shaft & 10 on the rear differential. I had to make 2 1/2 turns of my lower adjustable control arms to get a 3 on the shaft & 5.5 on the differential. I used ratchet straps to help pull the rear diff forward after shortening my control arms to help ease bolt line up.
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Old 06-27-2014, 04:54 PM
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Can I get away with only installing adjustable uppers or will I need adjustable lower control arms as well?
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Old 06-27-2014, 06:35 PM   #12
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Can I get away with only installing adjustable uppers or will I need adjustable lower control arms as well?
Rear uppers should be fine. My uppers are adjustable and my lowers are fixed.
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Old 06-27-2014, 06:36 PM   #13
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Can I get away with only installing adjustable uppers or will I need adjustable lower control arms as well?
If you have the 4" skyjacker lift in your sig line, your lowers are probably after market longer arms. You'll be okay unless your adjustable uppers move your track bar into the gas tank skid. Only way to know for sure is to try it.
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Old 06-28-2014, 09:15 PM
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So I think I did it! Thanks guys for all the help. Have an angle difference of 1, pinion is 1 greater than driveshaft. Test drove and didn't feel vibes at all, we'll see what happens over the next couple weeks

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