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FS: 2007-2013 Jeep Wrangler "HALO" Angel Eye KitSavvy Billet LED Tail LightsSavvy FOX IFP 4" Lift Shocks in Stock

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Unread 04-19-2004, 01:24 PM   #1
mezz
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Join Date: Mar 2004
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Sye?

this may sound like a dumb question but what exactly is a SYE?
i am putting on a 4" sus lift this weekend, but i am not sure what the SYE is and if i am going to need one
thanks for the help

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Unread 04-19-2004, 01:30 PM   #2
mezz
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by the way i am just going for looks i won't be doing any off roading. so this is why after reading all the stuff about a SYE i am not sure what exactly it is and if i need one on a daily driver
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Unread 04-19-2004, 01:50 PM   #3
Dan R
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You wont need one, don't worry.
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Unread 04-19-2004, 08:02 PM   #4
Cynic
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Quote:
Originally Posted by Dan R
You wont need one, don't worry.
i wouldnt just jump to say that.....alot of people need a SYE on a 3.5" lift....esp with RE lifts which tend to be more then 3.5"...or so i've read....

First of all i'm going to assume you have a TJ

What a SYE is, is a Slip Yoke Eliminator.....not to get too in depth about it but your jeep obvisiously has a short rear drive shaft with the increase in height your also increase the angles which the driveshaft leaves the transfer case and meets the rear axle.....if this angle is to great the u-joint slightly bind creating viberations while driving.....the sye replaces the slip yoke with a shaft that remains stationary, you also buy a CV driveshaft which will extent and retract....you adjust the pinion angle to 0 (i believe) and that takes care of any binding....only way to tell if you will definately need one is to put on the lift and drive it....if you get vibes while driving even with a transfer case drop (basically does the same thing as a SYE just not as effectively) then you'll probably need one....
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Unread 04-19-2004, 08:27 PM   #5
Mels95YJ
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Well, to add a little to what's been stated already.

You're transfer case has a slip yoke on the rear. The rear driveshaft slips in and out of the transfer case as the rear axle moves up and down. The tailhousing on the transfer case is also longer than the SYE, so by getting the SYE you can get a longer driveshaft which means less of an angle.

A BIG advantage of the SYE, besides a better driveline angle, is you can remove the rear driveshaft without losing all of your fluid. Once you "slip" the stock driveshaft out of the transfer case, all the fluid comes out. The slip yoke of the driveshaft "seals" the transfer case.

Like Cynic said, there's no way to tell if you'll need one or not unless you put the lift on. Should you? Yes, but that's decision you'll have to make according to your funds. Setting your rear pinion angle will depend on whether or not you have one or not. HTH

Mel
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Unread 04-21-2004, 09:37 AM   #6
mezz
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so is something that will be dangerous if not put on(break something, cause wreck) or just make for a rough ride
thanks
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Unread 04-21-2004, 04:07 PM   #7
Cynic
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Quote:
Originally Posted by mezz
so is something that will be dangerous if not put on(break something, cause wreck) or just make for a rough ride
thanks
worst case you will break a u-joint.....just do the lift and if you have vibes with a tc drop then get a SYE....if you dont get vibes then good you probably wont need one...
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