realmikewilson

so im thinkin if i swap out all of my old u joints my driveshaft vibes will go away....what would be the best u joint for me? ive got a 1996 jeep xj classic with a RE 4.5 super flex any kind of advise will help thanks guys

jmm0122

Lots of people use spicer u-joints. Sadly I don't think that you replacing the u-joints will have much effect on vibes. At 4.5"(bc its re more like 5.5") of lift you more than likely need a sye. I don't think a t-case drop will not help in with that much lift.

realmikewilson

ive got the tcase drop on it and it only really vibes around 30 to 40 and a lil at 15 to 25....im plannin on buying a sye with my tax return coming up next year in jan or feb is there anything else i could do to maybe get rid of the vibes?

jmm0122

Not really, shims may help a little but it's kinda up to you on whether or not it is worth the hassle of installing them if you will be doing a sye soon.

realmikewilson

how much would a good easy to install sye be

jmm0122

Depends on if you do a hack and tap or not. Plus you will need a new driveshaft itself, but I know some guys just use a front shaft in the rear.
So you are looking at a couple hundred bucks.

realmikewilson

i dont know if im capable of installing that kind of thing how would a shop charge for that and is it really that hard to do your self?

jmm0122

Umm im not sure, your looking at 2-3 hours of work at $75-$100 bucks an hour.

mickey_00xj

Is the vibe felt more in your butt or more in your feet and arms? Only reason I ask is that with it somewhat concentrated at certain speeds it's possible that it's more of a steering/tire balance issue than a driveline issue. I agree that a sye is probably needed, just don't know if that's really your problem at the moment.

On a side note, a sye isn't that difficult, as long as your t-case comes out alright. Just be sure to pay close attention to the rings and gears as you disassemble it, I suggest using a sharpie to mark where it all lined up originally. The instructions they come with are pretty detailed and really good about keeping you on track, usually.

MojaveXJ99

Iron Rock Offroad has their hack n tap set up with refurbed driveshaft for $200.00.

joetotheizzo3

I did my sye recently and found that 90% of my vibes are caused by my front pinion angle... so much for all that work hahaha

realmikewilson

its like comin from under my feet and i can hear it clunking sometimes when i put my foot on the gas then let it off real fast. sounds like it could be the front drive shaft but im not sure

VTJeep

my front ds (with a cardon joint) was shot. i thought it was the TC chain. sounded like it was stretched and would rub on stuff when in 4. but then it started to do this in 2wd and even at lower speeds. so a new shaft (85 bucks from JY) and all was well again.

edit- super easy to un/install- 4 bolts at each end of shaft to hold it to the yokes and bam! done.

The91XJ

I've called two off road shops near me and neither of them would take on the job of installing an SYE. Not very reassuring when I'm considering doing a hack n' tap myself. The only thing I'm worried about is cutting the out put shaft..

jeepincoop

i have a 01 with 5.5 i dont have a sye or drop kit.try angleing ur rear axle.try that first.