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Old 12-11-2012, 05:59 PM   #1
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Do I have an SYE?

I just bought a 2003 Wrangler with a 4" lift. I'm getting a lot of vibration from my drive shaft, i think . I'm not sure if the previous owner installed an SYE on the jeep when he lifted it.

Thanks for the help!
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Old 12-11-2012, 06:00 PM   #2
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Yeah that's a flange type SYE.

Do you have adjustable control arms with the lift or do they look fixed in length? I'm guessing the pinion angle is not the same as the ds angle. Can you post a pic where you can see the transfer case output and pinion on the rear axle?

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Old 12-11-2012, 06:03 PM   #3
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Thanks for the response!

Its dark now but I'll try to get a pic.
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Old 12-11-2012, 06:05 PM   #4
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Originally Posted by CaptFish View Post
Thanks for the response!
No problem, i edited my previous post too.. It might be easier for us to see if the pinion angle looks close, but you might need an angle finder to be sure
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Old 12-11-2012, 06:12 PM   #5
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Like this?
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Old 12-11-2012, 06:16 PM   #6
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Yeah.. It looks like the pinion angle is correct, obviously i can't know for sure without measuring.. My next wonder is if the u joints are still good.. Crawl under there and grab the center of the shaft and push it up and down and side to side.. There shouldn't be any movement.
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Old 12-11-2012, 06:19 PM   #7
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Bingo! we have movement, not much, but i can wiggle it slightly....sooo my next question, What type of U joints do i need? will stock joints work? or do i need something special because of the sye and shaft?
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Old 12-11-2012, 06:22 PM   #8
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Well figure out which joint it is, if it's the pinion end you can change it out pretty easily with a vice and a few sockets.. If it's one of the two in the double cardan joint, I'd suggest taking it in to a drive line shop.
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Old 12-11-2012, 06:24 PM   #9
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Thanks alot! you've been a huge help. I'll report back how it all ends up.
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Old 12-11-2012, 06:26 PM   #10
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Not a problem, happy to help
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Old 12-12-2012, 01:16 PM   #11
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Jeeps at the shop now. We got it up on the lift and used a strap wrench to really wiggle the shaft around, turns out two of the tree U joints were bad. I figured I'm doing two i might as well do the third as well, so I left the jeep with them to change out all three U-joints. Of course nothing is that easy, not 10 minutes after i left the shop, i got a call that there was also a "bad bolt" in the yoke, and this was likely the main cause of all my vibration. sooo I'm waiting on parts..
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Old 12-12-2012, 02:55 PM   #12
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Sucks you have to wait but I'm glad they found your problem. It will be a good investment for you to get a grease gun, and a needle attachment, make sure to grease all 3 u joints periodically, like after a wheeling trip or when you do an oil change if you don't wheel much. In fact it's a good idea to grease everything, look for zerks on your front axle, ball joints, tie rod ends, etc, everything that has a zerk. And have the shop show you the needle fitting on the double cardan itself, it doesn't look like a normal zerk but it needs greased too..

You should have 4 ball joints for the steering knuckles, top and bottom each side.
2 drag link ends, one on the knuckle, one on the Pitman arm.
2 tie rod ends on the tie rod, one on the driver knuckle, one attaching the tie rod to the drag link.
2 axle shaft u joints, if you can get to them, they attach the inner and outer shafts of the front axle.
3 u joints on the front drive shaft, and the needle joint in the double cardan up front.

Keeping up on the grease will help prolong the life of all your moving components.

I will say that it's possible some of the joints won't have a zerk and are a sealed unit, if so don't worry about them.

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