a_shirey

ill search it later when im on a computer.

jimmy21669

AAAAAAAAAAAHHHHHHHHHHHH....

Ok....YES, you CAN install the SYE in advance.

When you do the SYE you will be installing a front driveshaft in the rear which has the slip built in. This shaft will have at LEAST 6" of slip in it.

Think of it as parts of a triangle. If you lift the Jeep, one side get's longer and by Pythagorean's theorem, at least one other side has to get longer to compensate. Since the 3rd angle is the center distance on the body to the axle and cannot change, the driveshaft has to get longer. Unless the driveshaft is already stretched to it's limits, you will be fine. The driveshaft lengthens by a small portion when compared to the lift height. the difference in rear driveshaft length between no lift and 5" of lift is 1", well within the 6" slip tolerance, especially if you advance compensated for it. And unless you plan on lifting over 15" you will be fine. This is why guys who have a 3" lift and have an SYE do not need a new driveshaft when changing to a 6" lift. Same concept.


Hope this helps the masses.

For help on the Pythagorean Theorem, see here:

http://www.algebra.com/calculators/g...ythagorean.mpl


Sorry, I am a suspension math and geometry geek.

kuzican

does a front driveshaft from a XJ have that much slip? or would only a custom driveshaft or other ones have that much?

jimmy21669

XJ's have 6" total if lubed and properly working.

edit: at least the one I just rebuilt sitting in my basement does.

kuzican

ok, well that I did not know, and that is good info to know.

XJnewbiegirl

It was a car meet put together by college park down at Bowie bay sox stadium . That was like the only jeep there so I shared with yall ..

gone4x4

cripe sakes Jake,its the final pupa stage of a horsefly? naw, maybe something in a grasshopper or such, but still, in the final pupa stage.

a_shirey

so if i get a JY XJ front drive shaft there is no need for an SYE kit?

gone4x4

stick it with a pin-n-eat it, lottas protein!!

NewKindOfClown

The rear driveshaft is a Slip Yoke style. The front is a CV. You want to eliminate the slip yoke in the rear (with an SYE kit) so you can replace it with a CV style and use a front driveshaft.

a_shirey

so both an SYE with either a front driveshaft or new driveshaft?

jimmy21669

Ding Ding Ding....tell him what he's won, Bob!

LOL....yes. You are elimintaing the slip yoke from the transfer case and adding it to the driveshaft.

GOOGLE....there is more information on this that you will EVER be able to digest.

a_shirey

haha. ok. next question: front drive shaft from a JY, how reliable? should i just shell out the money for a new one?

SDC

I had enough time today to do the front bar pin eliminators. The bushings on both sides were slipping out of the shock eye. I used Energy Suspension bushings to replace the old ones. They were in stock at pep boys. I was lucky enough to have all the tools needed. It took me about an hour.

jimmy21669

50/50. Will more than likely need new u-joints from a JY. Second, if you go to a pull it yourself yard, they throw the trucks around on their belly and you will often get slightly bent shafts that the naked eye does not detect, but the shimmy in your *** end will.

However, if you go to a yard where THEY pull it, it should come with a warranty of some sort to exchange, at least, for 30 days.

You will need to measure after the SYE is installed to know what length you will need. That measurement will be the half slip measurement of the DS needed (half collapsed/extended).