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View Full Version : When to install a SYE?



jmatrixx7
04-03-2006, 04:53 PM
Currently have 4.5 inch lift w/1" transfer case drop and have no vibs from driveshaft. Switching over to claytons hard arm setup and with this crossmember i'll lose the the 1 inch drop. Will I need to put in a SYE with the same 4.5 inch springs? Anyone else running similar set up? Thanks

Rubber Chuck
04-03-2006, 06:07 PM
I think it probably varies from jeep to jeep. I have a 93 ZJ w/ 5.2 and a 249. When I bought it at 240k miles, It had a home brew lift that I imagine was prolly around 5.5" when originally installed....not sure how much sag it had when I got it....but it had plenty of room for 32s. Anyways...I had no vibration at all. I was under the impression that 249s were prone to vibration???
I installed RE 4.5" springs and developed a slight vibration between 20-25 and that was it. But alas..the 249 shit the bed today...so I will be swapping in a 231 w/ an sye

MUDDTRACKS
04-03-2006, 08:26 PM
It does depend on the jeep


I have a 98 zj 4.o and 242 with the RockKrawler 7" lift and had no problems with vibe's The kit drops the t-case 1"

fr3db3ar
04-04-2006, 11:27 AM
Though it may depend as others say....I just added 2" spacers to my F>R swap and don't sense any vibes.

jsteves
04-04-2006, 12:29 PM
the way the claytons crossmember is set it up, it gives 1/2"-3/4" drop anyway. so if you are fine now, i would guess you will be fine after the longarm install

97trxuszj
04-04-2006, 02:11 PM
I was running 5.5" lift and 34's with no SYE or Tcase drop, and had no vibes, I would just run without one until needed, or swap out the 249 and if you can get a deal with a SYE then jump on it.

nate
04-04-2006, 08:05 PM
I put one in because I wanted the stronger output shaft and I didn't like the factory setup. Also to help with the vibrations.

jsteves
04-05-2006, 12:48 AM
I put one in because I wanted the stronger output shaft and I didn't like the factory setup. Also to help with the vibrations.

agreed. i have one and like it for those reasons, but if you dont have the money or could use it elsewhere you should be able to do without.

matts96zj
04-06-2006, 10:15 AM
from what i understand... the ZJ/WJ wheel base added with the control arms/rear coils, let you lift much higher w/out vibes than the typical XJ. The arms allow the axle to hold a much better pinion angle through the travel of the rear suspension. This being said, I'm also @ 4.5" with zero vibes. I also know tons of guys who run more lift w/out problems & less lift on XJ's that need sye's. Hope that helps ya.