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Old 10-10-2008, 03:22 AM   #1
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SYE question

ok so I bought the 4" lift for the jeep. now I need to focus on what else I need to make this run the right way the first time...

I've already come to terms that I need to get a SYE. What kind should I get?

Do I really need a DS for the rear or will I be ok with the one I have now?

I decided that SS Braided Brake lines are a must so I'm going to get a set of those too.

One question about gears while I'm at it, I want to gear to 4.88 what do I need to buy? just ring and pinion? what constitutes as gears?

What else am I missing? Oh and the shocks are coming with it.

thanks in advance.
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Old 10-10-2008, 05:48 AM   #2
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well, your going to need a cv ds. as for gears your gong to need a master install kit, and a good gear man!!!!!!! gears are just r & p. as far as the 4:88 that depends on your axle,tires,motor, and trans? all play into witch gear is right for your rig

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Old 10-10-2008, 11:59 AM   #3
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I was doing some research on gears. I am planning on going to 4.88 also eventually. Won't you also need to get new carriers, depending on the axle. I believe D44 has a split at 3.73's.

But then I heard that it is possible to just get thicks gear's which is what I believe the Rubicon uses.
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Old 10-10-2008, 01:04 PM   #4
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thanks for the help. gears arn't really the problem right now that will be later down the line. I really just need info on the SYE and DS. why exactly do I need a CV drive shaft and why won't my current one work with the SYE?
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Old 10-11-2008, 12:52 PM   #5
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Quote:
Originally Posted by foxinthemudd View Post
thanks for the help. gears arn't really the problem right now that will be later down the line. I really just need info on the SYE and DS. why exactly do I need a CV drive shaft and why won't my current one work with the SYE?
Understanding what an SYE is will help you understand why you need a new driveshaft. SYE stands for Slip Yoke Eliminator. Your current driveshaft and rear TCase yoke is a slip yoke. The driveshaft rides on the output shaft of the TCase. When lifting the vehicle this causes the slip yoke to both pull further out on the shaft and also get extremely unhappy running at the angles that are involved. Installing the Fixed Yoke (Which is what an SYE is) forces you to a CV style driveshaft which can handle the angles and also a stronger overall setup. Any SYE you install will probably lengthen your driveshaft about 6 inches also.

Now that's not explaining every nut, bolt, and theory behind it, but I think you can get the idea.
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Old 10-12-2008, 02:45 PM   #6
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Thanks for your help guess. I will just install the lift and go from there...
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Old 10-13-2008, 12:18 AM   #7
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dont be arfraid of the SYE, it only took me about 45min. to complete. True, my t-case was on a bench but it's fairly straight forward install. and for the cv shaft, just buy a XJ front shaft and have it shortened. CHEAP
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Old 10-13-2008, 12:19 AM   #8
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i got my SYE from JB Conversions its for a chevy np241 w/ a jeep spedo set up.
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Old 10-13-2008, 12:48 AM   #9
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I'm not really worried about the install just worried that I might need to get one and a driveshaft just need more money! lol.
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Old 10-20-2008, 10:50 PM   #10
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Ok so my lift should be installed tomorrow. Now I need to find out what SYE and DS I need.

1. I what length DS and what SYE would I need to purchase for my jeep?
2. What transfercase do I have?
2.5L 4cyl with a 4" ultimate Full Traction lift kit.
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Old 10-20-2008, 11:10 PM   #11
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The sye you buy is up to you. There are several companies that make them and they pretty much do the same thing. Id just go with the PORC sye (performance off road center) because its the same thing as everyone elses but cheaper. For the ds, you'll need to measure the distance from the center of the yoke on the t-case to the center to the yoke on the axle. This measurment will determine your new ds. Personally Id go with a tom woods drive shaft, jsut give them your measurment and they will build it for ya. They have a killer warranty as well. Id assume you have the np231 t-case as the majority of wranglers do. This will not have any effect on your drive shaft as it will be a 1310 joint. Also, sye are only really available for the 231. However there are a few hack n' tap style sye's for the 242 case but I doubt you have one.
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Old 10-21-2008, 03:26 AM   #12
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so can I take the measurement off the axle yoke and T-case yoke as it sits now (well after the lift is finished of course)? and that is the size I need? thanks for the help
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Old 10-21-2008, 03:41 AM   #13
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PORC HD 231 SYE Kit does this one have the spedo gear setup accessibility?
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Old 10-21-2008, 11:23 AM   #14
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Performance Off Road Center
Has a lifetime warranty against breakage and I think it does have the speedo gear too. Check it out.

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