SYE with regular driveshaft? - JeepForum.com

 
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post #1 of 12 Old 04-16-2010, 05:45 AM Thread Starter
CJ51973
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SYE with regular driveshaft?

I mean without a double cardon joint. Any way this works? Does anyone sell one? With all the DS length gain by getting the slip yoke out of there it would seem a ujoint DS would work fine with moderate lift. And this is much cheaper to buy/modify/maintain. I had a CJ5 (T18A) with a 12" DS running at about 13 degrees at each joint and it was happy.


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post #2 of 12 Old 04-16-2010, 06:54 AM
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Maybe you can make it work with a CJ DS? You would have to see what the u-joint sizes are for the CJ cause I think they are larger.

Lou

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post #3 of 12 Old 04-16-2010, 07:48 AM
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If you pinion angle is correct I do not see why you could not.
You are still going to have to have a driveshaft made. One with a slip yoke in it.

93 YJ SOA 2" springs front, XJ springs rear w/main leaf added, High pinon 9 inch rear detroit locker front Dana 44 ARB 4.56 Gears, 36 inch Irok tires too much to list. www.mijc.org
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post #4 of 12 Old 04-16-2010, 08:47 AM
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As TSEJeepers stated, you need a driveshaft with slip in it... the CV part isn't necessissarily required but you must have slip in the shaft it's self. The whole reason you have a "slip-yoke" is to allow inward and outward movement of the driveshaft when the suspension experiences a shock (speed bump, off road, etc.). If there is not slip in the driveshaft OR in the yoke, you have a solid pice of steel connecting the driveshaft yoke to the transfercase yoke... When you hit a bump, it forces the driveshaft into the transfercase or into the pinion yoke, eventually one will give. You will 100% break the rear half of your transfercase, or destroy your pinion bearing if the driveshaft does not have a way of moving whenever the suspension experiences shock. At the shop I get people comming in all the time where the splines on the driveshaft siezed and wasn't letting their driveshaft expand and compress and it's amazing what that will do to a rear end.

The "CV" part of the driveshaft just allows for better driveline angles, most people dont know it but the most important part of the "CV" driveshaft they are putting in after getting a fixed yoke (SYE) is the part in the middle that allows the driveshaft to compress. Again, the "CV" part is just to allow constant velocity of the ujoints on both ends of the driveshaft which prevents wobbling and/or vibration.
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post #5 of 12 Old 04-16-2010, 08:51 AM
headstrong50
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i just bought a sye for my np231. i have a buddy who took a front drive shaft out of a cherokee and had it cut down and balanced, hadnt put it in yet though. that works doesnt it?

going off road is like being married, its great until you bang something you shouldnt.
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post #6 of 12 Old 04-16-2010, 08:53 AM
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Quote:
Originally Posted by headstrong50 View Post
i just bought a sye for my np231. i have a buddy who took a front drive shaft out of a cherokee and had it cut down and balanced, hadnt put it in yet though. that works doesnt it?
Yes, that works perfectly, it's actually a very popular mod. The reason it works is because the cherokee shaft has the section in the middle that allows you to stretch and compress the driveshaft... Put simply, it has the "really thin part in the middle".

Here is a picture of what i'm talking about... Click on the link and have a look, in the middle of the shaft, it narrows down, this allows the driveshaft to slide out longer and shorter.

http://www.quadratec.com/Assets/Imag.../105979-md.jpg
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post #7 of 12 Old 04-16-2010, 09:09 AM
headstrong50
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Yeah, that beats spending 400$ on a slip yoke drive shaft. although..when i was at the junkyard yesterday pulling some parts, while i was surrounded by cherokees, i thought it was the rear drive shaft...needless to say, i didnt find what i was looking for, and when i got home my buddy finally called back and informed me it was the front drives shaft. that was after i looked in about 20 cherokees for the drive shaft.

going off road is like being married, its great until you bang something you shouldnt.
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post #8 of 12 Old 04-16-2010, 11:08 AM Thread Starter
CJ51973
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Yep, I understand the shaft needs to slip. The Cherokee front is a good idea. I have a good shop for shortening/balancing. I was just wondering with a 16" or so shaft if it was necessary for it to be CV. I thought the yoke might be different between a CV and regular ujoint yoke. If so the SYE would need a differnt yoke.

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post #9 of 12 Old 04-16-2010, 09:29 PM
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yes the yokes are different.
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post #10 of 12 Old 04-17-2010, 08:46 AM
1998zj
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Hey Headstrong, which yard do you go to? I used a XJ front shaft for mine and it worked out great.

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post #11 of 12 Old 04-17-2010, 09:25 AM
stoveguy01
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I done just what your asking about on a cherokee I used to own. I just went to the wrecking yard with my driveline measurements and and ujoint and started searcing tell I found one the length I needed with correct u joints than got the u bolts for a driveline and maounted it to the yoke that came with the sye kit drove it like that for 2 yrs tell I lifted it more and needed to go to a double cardan style. hope that helps
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post #12 of 12 Old 04-17-2010, 11:09 AM
headstrong50
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Quote:
Originally Posted by 1998zj View Post
Hey Headstrong, which yard do you go to? I used a XJ front shaft for mine and it worked out great.
i go to pick-a-part. and sometimes pull-a-part.

going off road is like being married, its great until you bang something you shouldnt.
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