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Old 09-01-2012, 01:40 PM   #1
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Slip Yoke Eliminator - Question

Good afternoon,

Just lifted my TJ (4.0), currently sitting on 33" tires, and a 4" suspension lift. At the time, I did a 1" skid plate drop - because who needs 2nd, 4th or reverse, right?

So now I'm looking for the real thing and shopping for a SYE kit. What should the kit include? The main components are the new extention housing, shorter main shaft, and new CV drive shaft, right?

Anything anyone could offer would be helpful, and I wont be at all offended if you dumb it down Barny-style or tell me anything I already know! Also, if anyone could recommend a good kit, I'd appreciate it.

Thanks, guys!

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Old 09-01-2012, 06:19 PM   #2
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James,

Contact JB Conversions in Sulfur, Louisiana. He is very knowledgeable and he makes the SYE conversion kit.

Take care,

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Old 09-01-2012, 07:00 PM   #3
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Try Tatton driveshaft with the Teraflex SYE kit. He sends out both custom made DS to fit your jeep after you give him the specs. I bought off his eBay add. Great price with a great driveshaft
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Old 09-01-2012, 07:12 PM   #4
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The reputation of Tom Wood for pre and post-sale support for SYE kits and especially driveshafts is legendary. He has been my supplier of various drivetrain components and multiple driveshafts for probably 12-14 years and I wouldn't even consider anyone else. For sure (!) there are other high quality drivehaft vendors but I personally think there's more to it than just a good quality component.

Tom will guide you to what you need and spend hours on the phone if needed to make sure it's all done right, all the while smiling and laughing with you the entire time. Tom the most respected gentleman of the driveshaft industry, that is for sure.

Tom Wood's Custom Drive Shafts - Tom Woods Custom Drive Shafts Custom Driveshafts Specialist and ask to speak directly with Tom, he's the man.
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Old 09-01-2012, 08:14 PM   #5
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I'm pretty sure you're going to want adjustable upper control arms too if you don't have them already. You'll most likely need to change your pinion angle after you install the sye.
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Old 09-01-2012, 08:16 PM   #6
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Yep adjustable length upper rear control arms are required to properly set the rear axle's pinion angle so it will be correct and not cause the new CV driveshaft to vibrate itself to death.

The below illustration from Tom Wood's website is how the rear axle's pinion angle must be set for the new CV driveshaft...

P.S. Any SYE kit will include all the parts needed to install it.
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Old 09-01-2012, 08:25 PM   #7
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I second Tom Wood. He really takes the time to make sure you understand what is needed and the quality is great. Just so you know he sells both JB Conversion and Teraflex SYE kits. He is not really partial to one over the other unless you want to go super short and then he keeps JB Conversions on the shelf. With everything you are doing you may want to look into a belly up as you are more than half way there anyway. You will also need a rear shock relocator bracket (Teraflex $35) and a rear track bar relocator bracket ($50) or an adjustable rear track bar ($250) for your SYE to do it right. I just did this mod about a month ago. PM me if you have any specific questions that are not answered here. Hope this helps.
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Old 09-01-2012, 08:41 PM   #8
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I have heard many great things about Tom Wood, but I have never dealt with him personally.

I recently gave my Jeep an extreme makeover which included (among other modifications) 35" tires, a 4" Teraflex lift + 1" body lift + Teraflex tummy tuck. Needless to say, this meant I needed a SYE. I went all the way and chose the Teraflex Extreme Short Shaft kit in order to get the longest driveshaft possible. So far I have been very pleased with the results, both on the highway and on the trail.

For reference, here is a comparison of the Teraflex Extreme SYE, their regular SYE and a stock TJ setup:
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Old 09-01-2012, 08:53 PM   #9
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Originally Posted by doclouie View Post
I second Tom Wood. He really takes the time to make sure you understand what is needed and the quality is great. Just so you know he sells both JB Conversion and Teraflex SYE kits. He is not really partial to one over the other unless you want to go super short and then he keeps JB Conversions on the shelf. With everything you are doing you may want to look into a belly up as you are more than half way there anyway. You will also need a rear shock relocator bracket (Teraflex $35) and a rear track bar relocator bracket ($50) or an adjustable rear track bar ($250) for your SYE to do it right. I just did this mod about a month ago. PM me if you have any specific questions that are not answered here. Hope this helps.
I'm no fan of most shock relocator brackets because of the added leverage against the shock bracket's axle weld they give to trail obstacles. Rather than extended the mount out with an extension, I prefer to simply flip the shock over so the can is up and the shaft is down which gives the added clearance necessary after rotating the axle to raise the pinion angle. Most shocks, including the 4 different models I had on my previous TJ, work fine upside down. Not many can't be flipped to give the added clearance. The shocks I ran upside down without problem included Rancho R9000, Doetsch Tech DT-3000, ProComp MX-6, and Rubicon Express Monotube (a nitro). I think there was one more shock in that mix that I can't remember.

The best fix however being to pay a welder to cut the OE shock mounting brackets off the axle and re-weld them rotated back up to where they were before the pinion angle was raised. It's not a lot of work so a welder won't charge that much.
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Old 09-01-2012, 09:13 PM   #10
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I agree with Jerry that it will cause more stress and the best thing to do is have them cut off and rewelded, but I would not let many shops around here do that as I do not trust them. The shock relocators are the easiest way to move them hands down, but may not be the best way. I run Rancho 9000s and I adjust them way too much to have the adjusting valve way up under the Jeep. To each their own, but that is the way I did it.
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Old 09-02-2012, 08:07 AM   #11
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I think I'm defintely going to reach out to this Tom Wood gentleman. Quick question before-hand... is it absolutely necessary raise the pinion angle? I use my rig as a primary DD with an occational $#!7-your-pants ride on a trail with my daughter.

Thanks again for all the help, guys. All great advise!
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Old 09-02-2012, 10:40 AM   #12
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Quick question before-hand... is it absolutely necessary raise the pinion angle?
Absolutely positively. It's not simply a recommendation, it's an absolute must do. If you don't raise the pinion shaft to the proper angle as shown above, the resulting severe vibrations the u-joints will cause will start destroying the u-joints, seals, bearings, etc.
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Old 09-02-2012, 02:28 PM   #13
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go mega short
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Old 09-02-2012, 02:39 PM   #14
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go mega short
I would love to, but those get kinda pricey... Like I said, its mostly a daily driver... its just every now and then that I like to hit the trails. I dont do any serious crawling, I just do what I can to get as filthy as possible!
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Old 09-02-2012, 03:59 PM   #15
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There's no real advantage to a super-short SYE for 90% of those who need a SYE. Heck my previous rig was very well built, no drivetrain problems or vibrations with at times up to 5.5" of suspension lift yet I installed a standard length SYE kit, not a super-short, and it worked very well. Not once did I ever wish I had gone with a super-short.

There aren't many who will actually benefit from a super-short SYE except mentally. Not to mention once you install a super-short SYE, you no longer have the convenience of an easily swapped speedometer gear to recalibrate the speedometer with tire size or axle ratio changes.
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Old 09-02-2012, 04:37 PM   #16
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Ok, good to know!
Now, anyone out there install their SYE kit WITHOUT re-angling their pinion angle?
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Old 09-05-2012, 01:26 PM   #17
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So I spoke with some one at Tom Woods who said that raising the pinion angle is a must and I've spoken with someone at 4 Wheel Parts who said that raising the pinion angle is unnecassary...

Can anyone weigh in and give an objective Pro vs Con explination?
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Old 09-05-2012, 01:38 PM   #18
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So I spoke with some one at Tom Woods who said that raising the pinion angle is a must and I've spoken with someone at 4 Wheel Parts who said that raising the pinion angle is unnecassary..
You can rarely trust what 4WP says, Tom is (of course) correct. You MUST raise the pinion angle to match the angle of the driveshaft when installing an aftermarket CV driveshaft, absolutely positively. Massive driveshaft/u-joint vibrations will be the result if you don't raise the pinion to the correct angle.
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Old 09-07-2012, 05:36 PM   #19
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Originally Posted by Jerry Bransford
.You can rarely trust what 4WP says, Tom is (of course) correct. You MUST raise the pinion angle to match the angle of the driveshaft when installing an aftermarket CV driveshaft, absolutely positively. Massive driveshaft/u-joint vibrations will be the result if you don't raise the pinion to the correct angle.
Gotta stop talking to the janitor at 4wp. Haha
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Old 09-07-2012, 06:59 PM   #20
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"Custodian, dick!"

Tell me what movie that's from...
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Old 09-07-2012, 07:44 PM   #21
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"Custodian, dick!"

Tell me what movie that's from...
Too easy, Half Baked.
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Old 09-07-2012, 10:10 PM   #22
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Originally Posted by Jerry Bransford
Too easy, Half Baked.
You may he the coolest person on this forum... second to me!

Ha ha ha!

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