Do I Need a SYE? - JeepForum.com

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post #1 of 24 Old 02-13-2013, 11:05 AM Thread Starter
tom_sprecher
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Do I Need a SYE?

I'm in the middle of an 8.8 swap and have read some about SYE, CV joints and just running two U-joints. I have 3.5" of spring lift, 2" of shackle lift (both installed by PO), SUA and want to run 33's.

Do both ends of the transfer case get SYE?

Can you guys give me some advice as to why and what I should run? I plan on doing light to medium wheelin' and doubt I'll ever do rock crawling.

Thanks for your advice in advance.


Tom
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post #2 of 24 Old 02-13-2013, 11:21 AM
bogleparsons
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Only the rear of TC gets the SYE, yes with a total of 5.5" of lift your a good candidate for SYE.

It would be best since you havn't installed your 8.8 to hold off on the spring perch placement until after you have the SYE & DS in.

If it's not supposed to move and does use duct tape.
If it's supposed to move and doesn't use WD40
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post #3 of 24 Old 02-13-2013, 11:58 AM Thread Starter
tom_sprecher
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I was thinking about getting rid of the 2" of shackle lift. Would that lessen the need for a SYE?

Tom
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post #4 of 24 Old 02-13-2013, 01:23 PM
bogleparsons
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Yes with just the 3.5" spring lift you could probably get away with just a TC drop. You have any pics of the way it sits now?

You probably already have the TC drop I bet.

If it's not supposed to move and does use duct tape.
If it's supposed to move and doesn't use WD40
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post #5 of 24 Old 02-13-2013, 01:29 PM
dillonjm
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Can you get away with a drop, probably.

Does it make sense to lose over an inch of clearance at the skid that you just spent a bunch of money to gain? Not in my opinion.

My 2 cents, especially since you're setting up an 8.8, I'd do the SYE and weld the perches where they should be the first time.

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post #6 of 24 Old 02-13-2013, 01:49 PM Thread Starter
tom_sprecher
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Quote:
Originally Posted by bogleparsons View Post
Yes with just the 3.5" spring lift you could probably get away with just a TC drop. You have any pics of the way it sits now?

You probably already have the TC drop I bet.
I do have the TC drop. Actually the PO added even more spacers that a normal kit so the TC is now down about 2.25".

So let me get this straight. You add a SYE if you have a lot of lift (>3.5") and do not want to drop the TC. Is that right?




Tom
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post #7 of 24 Old 02-13-2013, 01:55 PM
Michaelgoesrawr
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Exactly right. The SYE is to allow you to lift the Jeep while allowing you to keep all the clearance you can. There was a guy running around here that was telling people to run both. One, the other, but both is stupid. I'd go with the SYE and lose that tcase drop. I bet its reeking havoc on your motor mounts. I would also sell the 2" shackles to some schmuck and get 1" boomerang shackles instead.

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post #8 of 24 Old 02-13-2013, 04:04 PM Thread Starter
tom_sprecher
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Quote:
Originally Posted by Michaelgoesrawr View Post
Exactly right. The SYE is to allow you to lift the Jeep while allowing you to keep all the clearance you can. There was a guy running around here that was telling people to run both. One, the other, but both is stupid. I'd go with the SYE and lose that tcase drop. I bet its reeking havoc on your motor mounts. I would also sell the 2" shackles to some schmuck and get 1" boomerang shackles instead.
The motor mounts are seriously twisted.

Do I have to get a new drive shaft with the SYE?

Tom
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post #9 of 24 Old 02-13-2013, 04:27 PM
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Quote:
Originally Posted by tom_sprecher View Post
Do I have to get a new drive shaft with the SYE?
yes, the new driveshaft will have a double cardan joint on the front side which can operate at the steeper angle.

The TC drop is meant to be a temporary measure but it is not a safety issue to run one long term and therefore a lot of people do. Pro: They work.


Regardless, the whole reason for lifting a vehicle, unless its a mall crawler, is for clearance and part of that clearance comes under the trans skid. Thats the Con. You would be amazed how far a couple inches will gain you here. The limit to trying to get away without using a sye is ~4". I have a 3.5" lift and 5/8" lift booms and do not run one. I also have NO tc drop. I got away with it by using a motor mount lift and setting the pinion angle appropriately when I installed the axle.

Your limited slip differential sucks.

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Any video of the sound?
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post #10 of 24 Old 02-13-2013, 04:35 PM Thread Starter
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Wow! The SYE and CV drive shaft will run $500-$600. It's getting pricey and I need to think if it will be worth it to gain 2" at the skid plate.

Who do you guys think has the best value for the pair?

Tom
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post #11 of 24 Old 02-13-2013, 04:42 PM Thread Starter
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Originally Posted by MLJeeper View Post
I have a 3.5" lift and 5/8" lift booms and do not run one. I also have NO tc drop. I got away with it by using a motor mount lift and setting the pinion angle appropriately when I installed the axle.
Do you have any details on the motor mount lift and the booms? Inquiring minds want to know.

Tom
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post #12 of 24 Old 02-13-2013, 06:29 PM
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Quote:
Originally Posted by tom_sprecher View Post
Wow! The SYE and CV drive shaft will run $500-$600. It's getting pricey and I need to think if it will be worth it to gain 2" at the skid plate.

Who do you guys think has the best value for the pair?
Its cheaper than 2" lift springs or 4" taller tires are, and for the same amount of clearance gain.

Check out JB for your SYE (about 200 bucks) and if you're on a tight budget get an XJ front shaft and shorten it at a driveline shop (about 150 total for shaft and shortening) or order a shaft from tom woods (about 3-350).

Translation: yes its worth it.

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post #13 of 24 Old 02-14-2013, 07:49 AM
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Originally Posted by tom_sprecher View Post
Do you have any details on the motor mount lift and the booms? Inquiring minds want to know.
Well, specifically I run M.O.R.E. 1" lift bomb proof motor mounts and 5/8" lift M.O.R.E. boomerang shackles on all 4 corners. But brand really makes no difference. Also if you do something custom which is easy and feasible you could go a little higher on the motor mount lift (MML) to give you more angle to work with. I wouldnt go to crazy with it though. Also, any more than an inch of MML lift is likely going to require a body lift of some sort for clearance. Its recommended for the 1" MML but a lot of people get by without it. It wont work for everyone but i was pleased it worked in this case. Test drive your angle before you weld.

Your limited slip differential sucks.

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Originally Posted by Anticanman View Post
Any video of the sound?
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post #14 of 24 Old 02-14-2013, 03:43 PM
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Quote:
Originally Posted by dillonjm View Post

Its cheaper than 2" lift springs or 4" taller tires are, and for the same amount of clearance gain.

Check out JB for your SYE (about 200 bucks) and if you're on a tight budget get an XJ front shaft and shorten it at a driveline shop (about 150 total for shaft and shortening) or order a shaft from tom woods (about 3-350).

Translation: yes its worth it.
X2 he speaks the truff. I spent 160$ on my sye and used a XJ front CV shaft $35 at most junk yards shortened and balanced for around 90$.

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post #15 of 24 Old 02-14-2013, 04:42 PM
Overhead
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including MML shafts and a new skid plate I'm at about a grand for my full tuck. but you don't need to add a taller skid plate. so that eliminates a few hundred bucks
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