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Old 06-03-2011, 08:40 PM   #1
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SYE questions

So I confirmed that the rear driveshaft is causing some vibes after installing a 3" lift with 1" t-case drop on my TJ. I took the rear DS off and drove up the street, smooth as silk. The vibes aren't violent but noticeable under acceleration, especially in 2nd gear (5spd.). My question is, how long do u-joints typically last with this condition? I put a new one in that I had thinking I could buy some time until I can afford a SYE and CV DS which leads to my next question. I'm leaning towards Advanced Adapters with a DS from Tom Wood. That looks to be around $500. I did find a Rugged Ridge kit with a DS (not sure the mfgr) for $400 on eBay. Then there's Teraflex, Currie... So which kit on the market is the best to get?
Thank you!
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Old 06-03-2011, 08:43 PM   #2
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I got advance adapters and a driveshaft from Adam's. 100% satisfied. It was considerably less than the TW shaft.

I dunno if it will last any less or more... It works for me

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Old 06-03-2011, 08:46 PM   #3
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I used the AA SYE and the Tom Wood's drive shaft.

I am not sure you can get an answer about what one is best. They do recommend different SYE's depending on what rearend you are running.
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Old 06-03-2011, 09:07 PM   #4
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Originally Posted by CapnDean View Post
I got advance adapters and a driveshaft from Adam's. 100% satisfied. It was considerably less than the TW shaft.

I dunno if it will last any less or more... It works for me
I've heard of Adam's but I haven't looked into his DS yet, I think I will! Thanks!
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I used the AA SYE and the Tom Wood's drive shaft.

I am not sure you can get an answer about what one is best. They do recommend different SYE's depending on what rearend you are running.
So far I've got two votes for AA, that looks promising, that is if its compatible with the ever so popular and sought after D35 that I have !
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Old 06-03-2011, 11:13 PM   #5
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Originally Posted by Phil05LJ

I've heard of Adam's but I haven't looked into his DS yet, I think I will! Thanks!

So far I've got two votes for AA, that looks promising, that is if its compatible with the ever so popular and sought after D35 that I have !
I have a D35 with the AA SYE
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Old 06-03-2011, 11:41 PM   #6
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Originally Posted by nick50471

I have a D35 with the AA SYE
Cool, thanks Nick. AA it is but I'm still wondering how long I can drive it with a vibration...it can't be good on the u-joints but I just don't have the money for the fix right now. I doubt I'll drive it more than 500 miles before I install the kit. Does that sound reasonable? I've had many lifted Jeeps but this one is the first to give me headaches!
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Old 06-03-2011, 11:51 PM   #7
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I just finished putting in a JB Conversion super short SYE. I went with a super short because I installed a Rokmen tummy tuck at the same time. I got a Tom Woods drive shaft. Both Rokmen and Tom Woods folks are some good people to work with, very helpful and knowledgeable. My Jeep had a 4 inch lift and 1 inch transfer case drop with the stock skid plate when I bought it. It too had vibration in the rear drive shaft, back u-joint was shot. The guy I bought it from said he put a couple of u-joints / year in it. Hope this helps.
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Old 06-03-2011, 11:52 PM   #8
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i dont think the vibrations are from too steep of a drivshaft angle. someone who knows more will chime in.
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Old 06-03-2011, 11:57 PM   #9
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i dont think the vibrations are from too steep of a drivshaft angle. someone who knows more will chime in.
Why wouldnt it be? Thats typically what happens. 3" of lift with only a TCase drop...thats an equation for driveline vibes. Especially considering he removed the rear shaft and the vibes went away.


Phil...take the rear shaft out again, drop it off at a local Driveshaft shop and have them throw some new joints in there. The vibration could also be that one of the joints is already going bad. That will buy you some time for sure. I had mine done for $50
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Old 06-04-2011, 12:46 AM   #10
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Originally Posted by DIE2FLY View Post
I just finished putting in a JB Conversion super short SYE. I went with a super short because I installed a Rokmen tummy tuck at the same time. I got a Tom Woods drive shaft. Both Rokmen and Tom Woods folks are some good people to work with, very helpful and knowledgeable. My Jeep had a 4 inch lift and 1 inch transfer case drop with the stock skid plate when I bought it. It too had vibration in the rear drive shaft, back u-joint was shot. The guy I bought it from said he put a couple of u-joints / year in it. Hope this helps.
Thanks! A couple u-joints a year huh... That sounds like a PITA! LOL! I don't have plans for a tummy tuck but I'll look into JB as well. I appreciate the info!

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i dont think the vibrations are from too steep of a drivshaft angle. someone who knows more will chime in.
Unfortunately the vibes are in fact from the rear driveshaft. Without it, it was fine. I guess that is fortunate because if not, I could be in for a world of headaches!!

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Why wouldnt it be? Thats typically what happens. 3" of lift with only a TCase drop...thats an equation for driveline vibes. Especially considering he removed the rear shaft and the vibes went away.


Phil...take the rear shaft out again, drop it off at a local Driveshaft shop and have them throw some new joints in there. The vibration could also be that one of the joints is already going bad. That will buy you some time for sure. I had mine done for $50
I put a new one in today for the first time, it's actually really easy, I have acsesss to a machine shop with all the tools... I only did the lower one at the axle, I figured that one would be the first to go and cause vibrations but the vibes are the same as before, the old u-joint with 142k looked flawless.
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Old 06-04-2011, 07:04 AM   #11
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read what i wrote guys. the angle isnt causing the vibes. bad u joints are probably the cause. or the driveshaft needs to be balanced.
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Old 06-04-2011, 07:36 AM   #12
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i thought you only needed a tc drop with 4" inches or more???? get rid of the tc drop??? try that, if you still have vibes, throw washer after washer in there to drop the tc instead of the 1" spacers they send with the kit..... also what kind a lift??? pics??? and sye and cv are a definite need in the future still for any serious rocl crawling!!!!
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Old 06-04-2011, 07:41 AM   #13
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i thought you only needed a tc drop with 4" inches or more???? get rid of the tc drop??? try that, if you still have vibes, throw washer after washer in there to drop the tc instead of the 1" spacers they send with the kit..... also what kind a lift??? pics??? and sye and cv are a definite need in the future still for any serious rocl crawling!!!!
it depends on the vehicle, some need a tcase drop with 3 inches of lift, others dont. and because the OP has 3 inches plus a 1 inch tcase drop and is STILL getting vibes, it isnt the angle of the rear driveshaft as i was saying earlier.

i has 4 inches of lift and a 1 inch drop on mine and had zero problems to this day.
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Old 06-04-2011, 07:55 AM   #14
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Every jeep is a bit different and yes some do need a sye@ 3" of lift. I had the same problem with mine on a 3.5 re lift. Then I got a sye kit and no more vibes. I know it wasn't the drive shaft because it went into another jeep with the same old joints with no problems to this day.
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Old 06-04-2011, 08:23 AM   #15
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Every jeep is a bit different and yes some do need a sye@ 3" of lift. I had the same problem with mine on a 3.5 re lift. Then I got a sye kit and no more vibes. I know it wasn't the drive shaft because it went into another jeep with the same old joints with no problems to this day.
did you have a tcace drop before you installed the sye? those vibes would be from the driveshaft being at too steep of an angle
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Old 06-04-2011, 08:44 AM   #16
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did you have a tcace drop before you installed the sye? those vibes would be from the driveshaft being at too steep of an angle
I had a 1" case drop and it didn't work for me either!

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