So.. Newby for sure, been reading and couldn't find what I'm looking fir so here you go, any help is much appreciated. the drive train noise is i the rear I had the front driveshaft off already,
01 XJ geared with 3:10's on 33's, RC 6.5" long arm lift and coil overs on the rear, sorry for the obnoxiously big pics, couldn't figure out how to make'm smaller.. rear further down at the pic of the SYE...

at 55-75 MPH the drive train sings, it has a SYE in it but its certainly not a shorty the best I've seen is the JB Conversions (saves me abut 4") be sides changing the SYE to the shorty and help the angle of the rear drive shaft is there anything I can do to drop the transfer case any more with the 6.5" RC Long Arm lift on it?

Thanks to all! Ivan

 

You don't need to drop the transfer case with a slip yoke eliminator.

There's a chance it is coming from the transfer case, but it's most likely the pinion angle (should be able to adjust with the upper control arm) or a bad u-joint in the rear driveshaft.

 

Hard to tell in those pics, but do you have any upper arms for the rear axle ? or just the lowers ?

 

more rear suspension pics please

 

This is the rear upper control arm, both are adjustable at the unibody

There is a bracket on the rear, its raining and dark..

 

ok...so....uni-ball set-up...........wondered when I didn't see any upper arms in the previous pics.

How well does that work ???

 

I can only assume by uni-ball set up you mean both upper control arms going to the one mount that's attached at the rear end, the uni-ball mount is secured using the rear end cover bolts. looking at that mount closer it seems like the uni-ball control arm mount should be wielded to the axle or something, but maybe thats overkill. Both of the upper control arms are adjustable, but obviously just going back to the same uni-ball mount. Other than the loud rational roar at higher speeds it drives good, runs strait and actually handles pretty well for what it is. I see you're in Newport News, do you know any jeep shops between here and there that would really know the front and rear set up to get it dialed in? The place here in Mechanicsville had nothing but crap to say about it.

Uni-ball mounted to the rear end

upper control arm mounted to the uni-body

 

Wow no stiffeners with a long arms and rear coils, sounds like a terrible idea. Looks like some funky backyard buffoonery

 

uhhhhhhhhhhh did you say that rear uni-ball mount was ONLY secured to the housing with the puny little diff cover bolts????? For the love of a car wreck, have that thing welded to the axle. you may need to look at your ring and pinion if your getting a "singing" noise.

 

There are a few things that concern me. The rear upper thing going on there looks like someone bolted a ball joint from an ifs vehicle to those arms. There is no stiffening done, the brackets that hold the rear arms to the frame look like they have one bolt and some booger welds holding them on, the diff cover bolts should not be used to support the upper arms, they will shear and it'll be a huge pain in the butt to get all of the broken bolts out probably, and it doesn't seem like everything was perfectly thought out/ set up. Besides that, the sounds you describe are bearing sounds, not vibrations. It's hard to diagnose over the Internet going off of what someone describes. If you have an sye in the rear, no matter what kind you should be able to get good angles and not have driveline vibrations since the Cherokee rear driveshaft is much longer than wrangler which seem to be the ones who companies market the short sye to. Personally I believe there is a lot to be done to the rig before I would drive it on the street. I do hope you resolve the issues you are having with it though.

 

I'll have to get some better pictures for you guys, I really don't think (or hope) its as gloomy as you guys describe. Its a premanufactured kit for sure, if the uni-ball kit was a better supported i.e wielded to the axles and the would that help the concern?. More to come..

 

Who makes the kit? I've never seen anything like that before.

 

Seeing the better pics now, not even sure it is a uni-ball setup....and even so, not the kind I was expecting.

No, I don't know any place around here that could set it up.

 

 

Its not the uniball idea that I think is dangerous it's the execution. Just looks like way too small of a joint to support both uppers and the fact that it's held on with the diff cover bolts.