SYE??

[ghetdjc320]

If you do an SYE, you will use a CV style. 1310/50 will depend on the yokes on each end. Remember too that you will need to angle your pinion about 1-2* below the transfer case output. 

[Jesse J]

How come you need to angle your pinion? And since the axles have 1310 yokes I should get an sye with the same yoke?

[Pete M]

vibrations.  note that with a CV, the rear axle points basically towards the back of the t-case rather than being roughly parallel like stock. 

 

 

[Jesse J]

Can that be done with shims on my perches rather than making new ones?

[ghetdjc320]

For u joint size, it just depends what size yokes your using. SYE’s are typically 1310 but can be 1350 same goes for axle yikes. Heck you can every have a 1350 to 1310 u joint. As for the pinion angle you can use shims but you’ll have to change the center pin on your leaf pack so the shim gets bolted to it. Stay clear of shim packs that don’t have a countersunk shoulder for the through bolt. You’ll see what I mean when you research shims. It is easier/better to just reset your perches unless that’s too much work. As Pete mentioned on his post, the pinion needs to point towards the new tcase output. I would imagine an sye will almost be a necessity on more than a 2” lift or so given the driveshaft will be much shorter using a doubler. More like a wrangler driveshaft. For the SYE I’ll still strongly recommend going with the JB conversions kit. It’s a much better design than almost anything else I’ve come across. 
 

 

Here is some suggested reading material for driveshafts and sye’s:

https://4xshaft.com/blogs/general-tech-info-articles/driveshaft-angles
 

&

 

 

http://jbconversions.com/products/sye/np231j_std_sye.php

 

 

[Jesse J]

Badass I appreciate the hell out of you guys. Driveshaft will Definetly be shorter but I don’t think anywhere close to wrangler length.

[Vandenborg1]

I just put a 6.5in lift on mine and I ended up with 47in on the driveshaft with a sye. So nowhere close to the wrangler

[ghetdjc320]

7 minutes ago, Vandenborg1 said:

I just put a 6.5in lift on mine and I ended up with 47in on the driveshaft with a sye. So nowhere close to the wrangler

Are you also running a doubler? There are a lot of different wrangler d shaft lengths

[Jesse J]

picked up a wide chain and a 6 pinon out of a 94 dodge 2500. its 23 spline and the doubler bound case is 21 but the 6 pinion is too long so do yall know if I can put the longe 23 spline in the rear and the short one right behind the trans? if that makes sense. just don't want to buy another input

[MiNi Beast]

Thats kinda the idea with the doubler as your front tcase will mate to trans and whatever spline fits must match. You only use the front half, gear box of the tcase and use the custom shaft to connect. 

 

[Jesse J]

Okie dokie then.