HD SYE Kit Questions

I'm about to order a HD SYE kit and axle shims (or longer shackles) and have a few questions.

1. Does the PORC HD SYE come with a new rear output bearing?
2. Would a 6 degree shim point the pinion a hair under the TC output? I have around 3-3.5" of lift.
3. I read that some early NP231 produced from 1987 – 1990 have the vacuum switch for the front axle disconnect housed in the rear output shaft housing, and that a new SYE housing does not allow for the vacuum switch to be reused. Does anyone have a picture of this so I can make sure that I don't have it?

Sorry if they are dumb questions. I'm pretty sure the PORC kit comes with an output bearing, but have 6 degree axle shims worked well for anyone with an auto, np231, SYE, and rear CV shaft? I really suck at math.

Ulver44 said:

Sorry if they are dumb questions. I'm pretty sure the PORC kit comes with an output bearing, but have 6 degree axle shims worked well for anyone with an auto, np231, SYE, and rear CV shaft? I really suck at math.

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I have a 3.5" RE kit, auto trans, NP231, Advanced Adapters HD SYE kit, Tom Wood double cardan rear driveshaft, and used 6 degree shims with my 8.25 rear. No problems whatsoever.

just look at your front axle and see if you have the disconnect type. its a big bulky chunk of iron on the back of the passenger side axle tube. if you got it just through a posi lock on it. or another axle.

trippled said:

just look at your front axle and see if you have the disconnect type. its a big bulky chunk of iron on the back of the passenger side axle tube. if you got it just through a posi lock on it. or another axle.

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I do have a vacuum disconnect front axle, but I just found a write-up that seems to show I CAN keep the vacuum disco system just by cutting down the shaft that pushes on the vacuum switch.

http://www.cherokeetalk.com/forum/f22/sye-install-pics-967/

Sweet! Screw that $200 posi lock.. for now, at least.

M4Madness said:

I have a 3.5" RE kit, auto trans, NP231, Advanced Adapters HD SYE kit, Tom Wood double cardan rear driveshaft, and used 6 degree shims with my 8.25 rear. No problems whatsoever.

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That's what I had hoped, Thanks a lot!

Measurements amongst different lift manufacturers (and even amongst stock XJ's for that matter) vary so much that you should use other's experiences only as a guideline. Best bet would be to install the SYE and new driveshaft, take your angle measurements, and then order the proper shims for your application. I know it means a few days of running with bad driveline angles, but that is really the only surefire way to get the right shims.