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Unread 04-25-2013, 05:31 PM   #1
Campsen
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4 inch lift with no SYE?

Am I going to need an SYE kit with a 4 inch lift? Idk what type of lift I'm going to order, I have 33x10.5's. an SYE kit with a new driveshaft angle is a huge turnoff, I can't afford that. I'll drop the transfer case if I have to but I've heard that some people still had to do SYE after the TC drop. Let me know if any of you have a 4 inch lift with no SYE, or whatever size lift you have on your 33's.

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Unread 04-25-2013, 05:41 PM   #2
Jerry Bransford
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A 1" t-case drop is seldom enough to eliminate the vibes of a 4" or taller lift. Sometimes adding a 1" MML (motor mount lift) will be enough when combined with a t-case drop but even those two combined are not always enough. So for that much suspension lift, a SYE & CV driveshaft is the better way to go though that would mean saving up for a little longer.

A solution to the SYE/CV driveshaft need would be to instead install a 3" suspension lift plus a 1" body lift to give you the 4" of clearance recommended for 33" tires. For that, a 1" t-case drop is usually (but not always) enough. When it's not enough, adding a 1" MML will usually do the trick.
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Unread 04-25-2013, 06:18 PM   #3
MetalMountainGoat
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I had a 1 inch t case drop on my jeep with a 3 inch lift, and still had some pretty good vibes coming from the drive line. Every Jeep is different, but in my case a SYE was needed even with just a 3 inch lift. Plus, a SYE opens up even more possibilties down the road, i.e. tummy tuck.
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Unread 04-25-2013, 06:32 PM   #4
larjeep
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You will never know for sure until u do it. But they case drop should be enough to start with.
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Unread 04-25-2013, 07:14 PM   #5
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I had a 1 inch TC drop back when I had a 4 inch suspension lift. I still had mild vibrations when accelerating from a stop. The vibes were never bad enough to toast a u-joint though.
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Unread 04-25-2013, 08:31 PM   #6
jsbeith
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I run a 4" Pro Comp on my 2002 TJ. I used the Skyjacker TC drop kit and it completely got rid of my vibes. I am about to swap in D44's f/r and that will require shortening my driveshaft(s). I will probably need to do the SYE with a Tom Woods driveshaft at that point.
Lift it and see if you get lucky like I did with just a TC drop kit.
Good luck either way you go.
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Unread 04-25-2013, 08:32 PM   #7
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*sigh* I feel like this is one of the most asked TJ tech questions out there.
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Unread 04-26-2013, 07:19 PM   #8
Campsen
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I have a YJ though, I posted this in the YJ tech forum
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Unread 04-26-2013, 07:20 PM   #9
Campsen
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IDK why it posted in the TJ forum though.. Do you think it's different since I have a YJ?
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Unread 04-26-2013, 07:25 PM   #10
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Moved to YJ Tech.
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Unread 04-26-2013, 07:28 PM   #11
BlaketheSnake
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I'd put one in if I was gonna do any real wheeling.
If not keep some gear oil and a spray paint or glass cleaner cap and duct tape in the jeep just in case.

I've given help to two Jeeps that needed these items before.

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Unread 04-26-2013, 09:00 PM   #12
Campsen
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I think I'm gonna do a 2.5 inch suspension on my 33's with tube fenders, $450 for a cv driveshaft and SYE isn't worth it to me. What do you guys think of that? and thanks for moving it to YJ tech
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Unread 04-26-2013, 11:14 PM   #13
jokerchief462
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My Tom Woods shaft was $309 to the door got the SYE kit on sale $169. Installation was a couple hours.
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Unread 04-27-2013, 08:29 AM   #14
sptrmike
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I have 4inch lift in mine with tcase drop, had very mild vibes but what i noticed was tcase seal and rear pinion seal were'nt holding up. the problem was after putting in the lift the drive shaft was to short. i called tom woods and spoke to a tech,i was told there should only be about 7/8 of an inch of the slip yoke shaft exposed with the vehicles weight on the suspension. i had just over 2 inches. they wanted to buy the sye and drive shaft set up they have ,but i went with the standard stye shaft instead, they told me i could possibly still have vibes. for the money difference i took the chance. i measured my shaft per tom woods web sight and added 1/4 inch. the reason i added the extra i ask them at tom woods what size shaft i should have with my actual measurement,and i got two dims with 1/4 inch difference, so i went to the longer side. i believe shaft with shipping was 200.00. that was over 53,000 miles ago no more vibes no more seals leaking. was i just lucky? i dont think so
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Unread 04-27-2013, 10:34 AM   #15
Anticanman
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Sye is around $160 and find a cv driveshaft off the front of a xj and have it cut and balanced.

It takes more work and less money than you thought.
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