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Old 03-24-2014, 09:55 AM   #1
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Vibration From Rear

Just put a 4" lift on this past weekend. Once I got it onto the road, I noticed there is a vibration coming from the rear end on acceleration, and only then. When I let off the skinny, it will go away. Also, it doesn't matter what speed I am going, when I press the gas it vibrates. The only thing I can think of is the drive shaft being at a weird angle. Does anyone have input or experienced this issue before.

Also has 2" BL

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Old 03-24-2014, 09:58 AM   #2
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Do you have an sye or transfer case drop installed? Sounds like drive line vibes.

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Old 03-24-2014, 10:02 AM   #3
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Have the transfer case drop on it. The kit came with a drop that is prob an inch or two.

sye?
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Old 03-24-2014, 10:06 AM   #4
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slip yoke eliminator
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Old 03-24-2014, 10:10 AM   #5
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SYE=Slip yoke eliminator. It eliminates the slip yoke at the rear of the transfer case, and is used with a double cardan drive shaft (two u-joints on the transfer case end) with a slip joint in the drive shaft. That enables the drive shaft to be longer which = less angle.

It sounds like you may have to drop the t-case a little more. Take some pictures of the rear suspension including drive line angles and post them up. A 4" lift normally take at least 1 1/2" of tc drop. Try adding a few washers between the skid and frame.

Here's what an sye looks like.
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Old 03-24-2014, 10:13 AM   #6
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I will have to get the pictures later today, stuck at work right now. No slip yoke eliminator, which makes me think that is the issue. When we got it down on the ground the drive shaft looked like it was at a weird angle.
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Old 03-24-2014, 10:16 AM   #7
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Try adding a few washers between the skid and frame.
Edited original
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Old 03-24-2014, 12:54 PM   #8
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Took some pictures
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Old 03-24-2014, 01:07 PM   #9
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Looks to me like you need to drop your skid some more or get an sye. With a stock drive shaft your transfer case angle and rear pinion angle should be close to the same.
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Old 03-24-2014, 01:08 PM   #10
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A ton of info. here.Guaranteed you will learn something:
What is a CV shaft and why do I want one? - JeepForum.com
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Old 03-24-2014, 02:26 PM   #11
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Thank you for that, definitely learned a lot. Would you recommend the SYE or just a motor mount lift.

if suggesting the SYE, which would be recommended for quality. Don't want to do any crap that I will just have to fix again sooner than later.
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Old 03-24-2014, 02:48 PM   #12
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Thank you for that, definitely learned a lot. Would you recommend the SYE or just a motor mount lift.

if suggesting the SYE, which would be recommended for quality. Don't want to do any crap that I will just have to fix again sooner than later.
There are several...this is my list.

JB Conversions, Inc.
Tom Wood's Custom Drive Shafts - Tom Woods Custom Drive Shafts Custom Driveshafts Specialist
TJ/LJ REAR UPPER JOHNNY JOINT® CONTROL ARMS
http://www.amazon.com/JKS-OGS160-Tra.../dp/B005TTZSQS
or http://www.amazon.com/JKS-OGS151B-Ad...+and+track+bar
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Old 03-24-2014, 02:59 PM   #13
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I will toss this out there, with the stipulation it MAY not be 100% correct. I am/ was under the impression that a MML AND a SYE was the "best" way to fix driveline issues, along with correct control arms.......I only bring this up as you mentioned doing just one and if the other was needed...a lot of us "less mechanically inclined" don't realize what all needs to be "changed/ swapped" when we start lifting our JEEPS.

By doing just the one thing, it may wear that part out "faster" if it is the "only" fix.
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Old 03-24-2014, 03:05 PM   #14
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I will toss this out there, with the stipulation it MAY not be 100% correct. I am/ was under the impression that a MML AND a SYE was the "best" way to fix driveline issues, along with correct control arms.......I only bring this up as you mentioned doing just one and if the other was needed...a lot of us "less mechanically inclined" don't realize what all needs to be "changed/ swapped" when we start lifting our JEEPS.

By doing just the one thing, it may wear that part out "faster" if it is the "only" fix.
Unless you have a really high lift kit, a SYE with adjustable control arms is all you need to correct driveline geometry. A MML will help if you have a tummy tuck to reduce the rear driveshaft angle a little. Remember, as you reduce the rear driveshaft angle with a MML, you steepen the front one.
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Old 03-24-2014, 03:11 PM   #15
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I will toss this out there, with the stipulation it MAY not be 100% correct. I am/ was under the impression that a MML AND a SYE was the "best" way to fix driveline issues, along with correct control arms.......I only bring this up as you mentioned doing just one and if the other was needed...a lot of us "less mechanically inclined" don't realize what all needs to be "changed/ swapped" when we start lifting our JEEPS.

By doing just the one thing, it may wear that part out "faster" if it is the "only" fix.
If using a sye on a 4" lift, a mml is not needed...the sye will take care of the vibes. If you use a mml on a 4" lift, it will not change the angle enough to get rid of vibes (and btw, no vibes are acceptable) without also doing some transfer case drop.

Having said that, some of us still use a mml even though we have a sye because we've also done a tummy tuck (or belly up skid).

Here's a set of pictures of mine, the first with a skyjacker 4" lift and giant transfer case drop that I was replacing before a year was up, the second after the sye install with the skid in the stock location, and the third with the tummy tuck. You can see the difference it would make when crawling over rocks.
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Old 03-24-2014, 03:14 PM   #16
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Originally Posted by jeepwayoflife View Post
Unless you have a really high lift kit, a SYE with adjustable control arms is all you need to correct driveline geometry. A MML will help if you have a tummy tuck to reduce the rear driveshaft angle a little. Remember, as you reduce the rear driveshaft angle with a MML, you steepen the front one.
Thanks for the information...as I said IDK for sure if it was 100% correct...I only have an OME 2.5 SL and JKS 1.25"BL and did both/ all 3 SYE MML and control arms...and it SEEMS to feel like stock.....I was unsure as OP is looking at a total of 6"s of lift (4"SL and 2"BL)
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Old 03-24-2014, 03:17 PM   #17
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See this is why I like this Forum helpful explanations to confusing things...FWIW the TT is coming for my TJ eventually......
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Old 03-24-2014, 03:50 PM   #18
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Thanks for all the info, it has helped a lot. I'll have to go with the SYE since the transfer case has been dropped and the lift kit came with lower control arms.
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Old 03-24-2014, 03:59 PM   #19
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Thanks for all the info, it has helped a lot. I'll have to go with the SYE since the transfer case has been dropped and the lift kit came with lower control arms.
You might want to try adding two or three washers between the skid and the drop on each skid bolt to see if that takes care of the vibes.
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Old 03-24-2014, 07:41 PM   #20
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I will try the washers first, not today though with the sleet and snow coming down.
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Old 03-25-2014, 03:38 PM   #21
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You might want to try adding two or three washers between the skid and the drop on each skid bolt to see if that takes care of the vibes.
Thanks for the input water dog. Just got done adding some spacers to it that I had left over from wife's hitch. Seems to have helped for the most part, I will have to see about adding some more on Friday.
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Old 03-26-2014, 08:31 AM   #22
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So now I'm thinking I might do the SYE. If I was, would I be able to get rid of the skid drop and bring back up to meet with the frame?
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Old 03-26-2014, 03:31 PM   #23
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With the much lift you need a SYI kit an I take that drop kit off after doing that.
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Old 03-26-2014, 03:42 PM   #24
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So now I'm thinking I might do the SYE. If I was, would I be able to get rid of the skid drop and bring back up to meet with the frame?
Yes
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Old 03-26-2014, 04:51 PM   #25
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Ok sounds good, does anyone have any input on a good SYE to go with?
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Old 03-26-2014, 05:26 PM   #26
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Ok sounds good, does anyone have any input on a good SYE to go with?
Post #12 on this page.
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Old 03-27-2014, 10:02 AM   #27
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Ok new question because I have am still learning. If I buy the SYE, I will still need to buy a new driveshaft correct?
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Old 03-27-2014, 10:10 AM   #28
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Ok new question because I have am still learning. If I buy the SYE, I will still need to buy a new driveshaft correct?
Yes, you will need (1) The sye, (2) A double Cardan drive shaft of the appropriate length, (3) At least upper rear adjustable control arms (Uppers and lowers would be better), and (4) An angled rear track bar relocation bracket.

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