echdaviem Posted January 12, 2012 Share Posted January 12, 2012 So when I got my AX15 it came with and NP231 and I just noticed that it has an SYE installed on it. So my question is, do I need to change the angle of my axle to be able to use the SYE? I know I have to change my drive shaft, any one know where I can get one? I have a short bed 4.0 BA10/5 NP231 soon to be AX15. Thanks for the help! Link to comment Share on other sites More sharing options...
foreman1063 Posted January 13, 2012 Share Posted January 13, 2012 If you run a CV drive shaft you will have to the rear axle pinion angle until the axle pinion points directly at the xfer case yoke. Link to comment Share on other sites More sharing options...
echdaviem Posted January 13, 2012 Author Share Posted January 13, 2012 Do I have to run CV shaft? Link to comment Share on other sites More sharing options...
adam518 Posted January 14, 2012 Share Posted January 14, 2012 Yes. The slip yoke is designed to allow for in and out movement as the axle travels up and down, effectively making the length between the back of the trans and the pinion yoke closer and farther apart. You have to have something that can allow for the change in distance. If you have a sye, there is no slip yoke. Therefore, the length of the driveshaft has to allow for the difference. A sye requires a cv driveshaft. Link to comment Share on other sites More sharing options...
nitroxsteve Posted January 14, 2012 Share Posted January 14, 2012 Yes. The slip yoke is designed to allow for in and out movement as the axle travels up and down, effectively making the length between the back of the trans and the pinion yoke closer and farther apart. You have to have something that can allow for the change in distance. If you have a sye, there is no slip yoke. Therefore, the length of the driveshaft has to allow for the difference. A sye requires a cv driveshaft. A CV shaft or a shaft with a slip joint? Link to comment Share on other sites More sharing options...
Regger Posted January 14, 2012 Share Posted January 14, 2012 I do believe that you don't need to have a CV joint on your driveshaft. You just need a flanged yoke on the driveshaft with a splined slip joint in the shaft. That way you can keep the pinion in its stock location and still maintain the benefits of the SYE in the t-case. I believe the early YJ front shafts were like this. They didnt need a CV joint because the shafts were so long there just wasn't that severe of an angle to need a CV. HTH Ryan Link to comment Share on other sites More sharing options...
cody4359 Posted January 14, 2012 Share Posted January 14, 2012 might as well spring for a custom CV shaft, modding a reg will be around half the price. had mine made locally for $380 Link to comment Share on other sites More sharing options...
Boots Posted January 14, 2012 Share Posted January 14, 2012 MY np231 has a RE Hack N Tap SYE, It was on it when I got it. The drive shaft I had made does not have a CV joint on it, but does have a slip yoke. There are regular U-joints on both ends. From what I understand, CV joints are for vehicles with very steep drive lines, (like CJs) Comanche's don't typically have very steep drive line angles. Don't CV joints require more maintenance and such? Link to comment Share on other sites More sharing options...
cody4359 Posted January 14, 2012 Share Posted January 14, 2012 what, like greasing..... just like your supose to do to a U-joint. how big of lift, etc are you running? I'm around 7" and my axle was setup for a cv but running a reg shaft, so when i did the sye and 2 low i went for a cv to try smoothing out the ride. if you get curiouse about your angles, checkout this page. http://www.pirate4x4.com/tech/billavist ... ndex2.html Link to comment Share on other sites More sharing options...
Regger Posted January 15, 2012 Share Posted January 15, 2012 When I did the SYE on mine, I went with a CV joint. Not because of the angle, but because it raises my pinion a couple inches to try and keep it out of the rocks. But because I already had an extra CV joint from one of my spare front shafts, the cost to build my driveshaft wasn't anymore than a regular build. Ryan Link to comment Share on other sites More sharing options...
Bounty Hunter Posted January 11, 2013 Share Posted January 11, 2013 Usually cheapest and easiest to get a used MJ/XJ/TJ front CV driveshaft and have the length modified for your use in the rear. Link to comment Share on other sites More sharing options...
JFAComanche6 Posted January 11, 2013 Share Posted January 11, 2013 Usually cheapest and easiest to get a used MJ/XJ/TJ front CV driveshaft and have the length modified for your use in the rear. Hm, good idea...so out of curiousity, if I put a solid ds on an sye, something would probably get broken, right? Link to comment Share on other sites More sharing options...
Biotex Posted January 11, 2013 Share Posted January 11, 2013 Hm, good idea...so out of curiousity, if I put a solid ds on an sye, something would probably get broken, right? If your replacement DS does not have a way to lengthen and shorten depending upon flex, then you will most definately break something. If I had to guess, it would be the expensive aluminum housing on your transfer case. Link to comment Share on other sites More sharing options...
Geonovast Posted January 11, 2013 Share Posted January 11, 2013 Hm, good idea...so out of curiousity, if I put a solid ds on an sye, something would probably get broken, right? There's no probably about it. You WILL break something, and it will be the most expensive part in the system. That, and it would be nothing short of a miracle that the stupid thing would be the exact, perfect length you would need it to even bolt in. Link to comment Share on other sites More sharing options...
desertmike Posted January 12, 2013 Share Posted January 12, 2013 Even though this thread is a year old I still have my .02 to give. i don't think you need a SYE because of the wheelbase. Why not take the input shaft from the new TC and put it in your original TC. Then no drive shaft modification is needed. There are several different input shafts so make sure its the right one. If not they are about $40-50 used. Link to comment Share on other sites More sharing options...
Bounty Hunter Posted January 12, 2013 Share Posted January 12, 2013 I resurrected an old one, didn't I? Oops, sorry about that, need to watch closer. Link to comment Share on other sites More sharing options...
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