do i need a sye/cv driveshaft for a 4" zone lift? - Page 3 - Jeep Wrangler Forum
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Old 01-31-2013, 09:18 PM   #61
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I just had em last weekend. When you put your foot on the gas it'll vibrate. It'll vibrate worse in the higher gears. It's pretty noticeable and very very annoying to drive with it.

Think unbalanced front tires doing 80 down a highway. Without the steering wheel wobbling.

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Old 01-31-2013, 09:21 PM   #62
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Originally Posted by elclipo View Post
Not to jack the thread but, what do the driveline vibes feel like? I have a 4" lift with a t-case drop. Everything seems fine but I'm paranoid by nature so I want to make sure I know what to look/feel for.

Nice lift by the way.
If you think you might have vibes, you probably do. They can vary depending on how much the angles are and what condition the joints are in so it'd be hard to describe. Mine were barely noticeable and probably only by me since I was used to what it used to feel like. If you want to know for sure, drive your Jeep at varying speeds up to 60mph and all the gears. Then pull over and remove the rear driveshaft, put in in 4h and drive the same route at the same speeds.

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Old 01-31-2013, 09:25 PM   #63
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The only vibe (if I can call it that) is ocassional and only at low speeds. It's more of a bouncy feeling that what I would call a vibration.
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Old 01-31-2013, 11:38 PM   #64
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I'd get the SYE and CV driveshaft from Tom Wood at Tom Wood's Custom Drive Shafts - Tom Woods Custom Drive Shafts Custom Driveshafts Specialist who will provide unsurpassed pre and post-sales support. Tom is genuinely a good guy who will walk you through the entire process. Click on the 'Tail Shaft Conversion kits' link in the top-middle of the page just above the big u-joint in the center.

The only other thing you'll need will be a pair of adjustable length upper-rear control arms which are needed to raise the rear axle's pinion angle up to match the requirements of the new CV driveshaft.

Once you're on the SYE/CV driveshaft page, you'll be faced with some choices. Tom will walk you through them but for most of us not planning extreme builds, the standard length (non super-short) is fine and makes it so you don't need to install an electronic speedometer calibrator like the Super-Short SYE kits all require. I installed a standard non super-short SYE on my previous TJ and it worked great.

I'd also go for the 'X' version of the driveshaft which simply gives you more spline length on the shaft for not much additional $$$. That just means the shaft can move in/out more when you're offroading without running out of length.

Tom will spend enough time with you that you'll be comfortable when you're done with the order. Mention that I referred you when you call in to ask for Tom if he doesn't pick up the phone which he does about half the time.

Thanks for the info Jerry. Much appreciated!
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Old 02-01-2013, 01:32 AM   #65
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I've heard that if you put on a 4 inch lift and a 1.25 body lift with a 1 inch Mml the motor mount lift will reduce the driveline angles enough too where the slip yoke isn't needed, is this correct?
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Old 02-01-2013, 05:47 AM   #66
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Originally Posted by BLK00TJ View Post
If you think you might have vibes, you probably do. They can vary depending on how much the angles are and what condition the joints are in so it'd be hard to describe. Mine were barely noticeable and probably only by me since I was used to what it used to feel like. If you want to know for sure, drive your Jeep at varying speeds up to 60mph and all the gears. Then pull over and remove the rear driveshaft, put in in 4h and drive the same route at the same speeds.
If I don't have an sye and I remove the rear driveshaft to drive isn't that gonna make a heck of a mess from transfercase lube?
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Old 02-01-2013, 09:03 AM   #67
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Originally Posted by All Terrain TJ

If I don't have an sye and I remove the rear driveshaft to drive isn't that gonna make a heck of a mess from transfercase lube?
That was my first thought. I don't think you can remove the shaft without oil pouring out. Damn slip yokes....
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Old 02-01-2013, 09:34 AM   #68
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That was my first thought. I don't think you can remove the shaft without oil pouring out. Damn slip yokes....
You can remove the shaft without losing any fluid.
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Old 02-01-2013, 09:42 AM   #69
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That was my first thought. I don't think you can remove the shaft without oil pouring out. Damn slip yokes....
That's YJ tech, welcome to TJ's!! New and improved!!
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Old 02-01-2013, 09:45 AM   #70
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Originally Posted by Jerry Bransford View Post
I'd get the SYE and CV driveshaft from Tom Wood at Tom Wood's Custom Drive Shafts - Tom Woods Custom Drive Shafts Custom Driveshafts Specialist who will provide unsurpassed pre and post-sales support. Tom is genuinely a good guy who will walk you through the entire process. Click on the 'Tail Shaft Conversion kits' link in the top-middle of the page just above the big u-joint in the center.

The only other thing you'll need will be a pair of adjustable length upper-rear control arms which are needed to raise the rear axle's pinion angle up to match the requirements of the new CV driveshaft.

Once you're on the SYE/CV driveshaft page, you'll be faced with some choices. Tom will walk you through them but for most of us not planning extreme builds, the standard length (non super-short) is fine and makes it so you don't need to install an electronic speedometer calibrator like the Super-Short SYE kits all require. I installed a standard non super-short SYE on my previous TJ and it worked great.

I'd also go for the 'X' version of the driveshaft which simply gives you more spline length on the shaft for not much additional $$$. That just means the shaft can move in/out more when you're offroading without running out of length.

Tom will spend enough time with you that you'll be comfortable when you're done with the order. Mention that I referred you when you call in to ask for Tom if he doesn't pick up the phone which he does about half the time.

One other question. Was about to call Tom this morning and started looking at Adj Upper Rear control arms. Do you have to buy an SYE/CV combo if you just install the control arms and try to adjust the pinion angle while using the same driveshaft and Tcase drop kit? All the info says you buy them to adjust pinion angle after putting a lift on. If that is my ultimate goal, is it necessary to buy the SYE/CV combo? Confused but if I have to buy both I will. Just looking at the most economical way to do it as like I mentioned, I won't be off roading and if I do, it would be very minor. Just wanting the vibes to go away as well as the bouncing at low speed I have now.
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Old 02-01-2013, 09:48 AM   #71
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You can't adjust the pinion angle to compensate for a 4" lift. If it were that simple we wouldn't need SYE kits and CV driveshaft. Not to mention your OE driveshaft will be too short after installing the SYE kit and its slip joint at the front won't connect up in front to the SYE's output shaft u-joint yoke.
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Old 02-01-2013, 10:19 AM   #72
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Originally Posted by Jerry Bransford View Post
You can't adjust the pinion angle to compensate for a 4" lift. If it were that simple we wouldn't need SYE kits and CV driveshaft. Not to mention your OE driveshaft will be too short after installing the SYE kit and its slip joint at the front won't connect up in front to the SYE's output shaft u-joint yoke.

I figured you'd say that but just wanted to confirm before I throw another $800-$1000 into the pot. I won't need an adjustable rear track bar will I? Also, any recommendations on a set of rear uppers?
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Old 02-01-2013, 10:25 AM   #73
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Originally Posted by DevilDogDoc

That's YJ tech, welcome to TJ's!! New and improved!!
Haha I was wondering why I only saw it happen with YJs and old XJs... Learn something new every day!
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Old 02-01-2013, 10:32 AM   #74
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A rear trackbar relocation bracket made with an angle for a CV driveshaft installation will be all you need for the track bar. That angled style of trackbar relocation bracket compensates for the steeper track bar bracket angle that will be introduced at the track bar driver's side mounting bracket when the axle is rotated to raise the pinion shaft for the new CV driveshaft.

Like this one... Rubicon Express Part RE1602 - Rear Track Bar Bracket -RH2

Adjustable-length control arm-wise, I like Currie's arms but I'd have to assume you can get a pair from Zone that will be less expensive.
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Old 02-01-2013, 10:53 AM   #75
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Thank you again Jerry.
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Old 02-04-2013, 07:41 AM   #76
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Originally Posted by BLK00TJ View Post
If you want to know for sure, drive your Jeep at varying speeds up to 60mph and all the gears. Then pull over and remove the rear driveshaft, put in in 4h and drive the same route at the same speeds.
thats a graet idea. will try this weekend.
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Old 02-07-2013, 09:59 PM   #77
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Man that green Sahara s one ugly jeep
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Old 02-08-2013, 09:15 AM   #78
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Man that green Sahara s one ugly jeep
I agree! Who in their right mind would like that combo Now I just need to find the paint code for the shop to repaint the tailgate. Can't find the sticker with the info anywhere.

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