dukie564

Deaver Springs.

Swirlchaser

Gotcha, I would agree with that.

McCaffrey

How are you going to make the drive shaft longer unless you move the axle backwards. Lowering the axle 4.5" is only going to make a tiny difference in length.

Go here and you can see the difference is going to be around a 1/4-1/2". http://easycalculation.com/pythagoras-theorem.php

Different subject: Mine picked up a tiny vibration when I swapped the C8.25 from the D35. Now I'm wondering if it's enough vibration to prod me into getting a CV/SYE. If I do that I'd like to replace the NP242 with a NP231 at the same time.

Swirlchaser

The SYE is shorter, allowing for a longer axle and relocation of the joints to improve angles.

xj_maniac_newb

Thank ya buddy

McCaffrey

I thought we were comparing apples to apples but I see what you're saying on how the axle is longer. However I think you'll find the angle change is still insignificant. If you're changing the axle length and adding a CV(DC) it's the CV(DC) that's removing the vibration because the axle rotation is now linear with the xfer case output shaft.

Swirlchaser

The main reason is to remove the Slip Yoke setup. at 4.5" inches of lift AND full flex or drooping a tire you're coming dangerously close to dropping a driveshaft. I personally think a double cardan style shaft is stronger and smoother, less vibe is a benefit but not the main reason for doing it.

McCaffrey

I'm right there with you on that. That would suck.

wgreeves

Jeepers:

I am getting a two inch lift on my 2001 and i talked about it with you guys last week. The guys lifting it for me say that the rubicon 2 inch lift kit has no corresponding monotube shocks that come with it, so i will have to stick with the ones that come with it, that are not supposed to be that great. does anybody know of any shocks that are better than the twin tubes that come in the rubicon kit that are compatible with the two inch lift????

wgreeves

they do have montube shocks but apparently they dont work for three inches of lift and under.

bhennessee1

Tire size has a lot to do with shock compatibility. You need to stuff your tires as high as they will go, then measure from shock mount to shock mount, that measurement is the longest collapsed length shock you can run. I can run shocks for 6 inches of lift on my xj because I have big tires on a 3.5 inch lift.

Slugger

So quick question for you guys.. got my 3 inch lift installed about a month ago. had vibes. got a sye installed with a CV drive shaft and still had a *small* amount of vibes at about 30mph-32mph after that its gone. but at about 60mph i get a resonating vibration that goes off and on.

I removed my front driveshaft and still have the symptoms so its not the front.

I got my sye and driveshaft installed at a driveline shop. they didn't shim the axle to point the pinion straight at the tcase. there is a bit of a angle there. Could that be the problem?
I guess it couldn't hurt to get some 2* steel shims to find out.

They have installed a lot of SYE's on cherokees so you think they would have said something. unless no one else has had problems after getting them installed. I didn't know I needed shims until reading about it after still having vibes.

the transmission mounts are fine also.

dukie564

the pinion should be pointed down slightly (a few degrees) from straight at the TC to account for axle wrap during acceleration.

H-Town Street Crawler

ok ive lost track of how many pages ive been threw. I have a 01 xj 2wd and i want to do a 4.5 inch lift with 33's. ive been looking at the RC 4.5" X-series Kit. now i know there is gonna be a few more things im gonna need to make everything work. its mostly gonna be street truck when i get some time sand, mud and maybe a light trail every blue moon.

Slugger

I mean the yoke at the axle, its pointed down a few degrees and not pointed straight at the transfer case. I believe its supposed to be pointed straight at the TC.

like this -





Mine has a angle at the axle. Do you think that angle could be causing the slight vibration? I would have to get shims and figure out what degree I need them to be.