Cherokee driveline vibes after Sye

flyn289

flyn289

Active Member
Joined
Sep 19, 2012
Location
Charlotte
2000 Cherokee with a rustys 4.5" lift. Recently installed a Rugged Ridge Sye and Xj Front dshaft. Measured out the angles and ended up using 6° shims. Pinion angle is within spec. Have made sure tcase yolks are tight. Tranny mount is good. Still getting vibrations. Its worse when on the accelerator. Any ideas?
 
Sounds like a bad ujoint or CV ball. Are the joints new?
 
Yep...all new 1310 spicers and had the center cup repacked with grease. My driveshaft guy said it was good. Ive tried multiple shafts as well. Same result
 
Maybe have the DS balanced? Also if it hasn't been get it aligned. Mine is setup similar and I've had some minor vibes but an alignment really cured most of those.
 
I assume you have the aw4 and with those i haven't read of issues but I had to use a 4cylinder trans mount with my ax-15 and RC long arm setup to get the transmission to line up. The new standard one I bought was clocking the transmission towards passenger side really bad.
 
Its been aligned. Driveshaft has new ujoints, center cups has been repacked with grease, driveshaft has been balanced, cant feel any abnormal motions. Dshaft angle is 16° and pinion is 13°…
 
Tires are balanced too I assume? Maybe take it to a 4wd shop and have a second set of eyes look at it. You sound like you know what you're doing but it couldn't hurt. Or maybe at least post pics of your drive lines.
 
Its not the tires. It reproduces the vibe on the lift. 4wd shop i.went to said outta balance rear dshaft when i had the old jyard shaft in. Put the new shaft in last night same thing
 
I'm by no means a drive line expert I have trouble even understanding it all sometimes. I'd definitely post pics for some of the guys that are though especially some profile shots of the DS so they can view the angles. My understanding though is a couple of degrees of separation is good/ok but maybe with the 3 degrees separation you describe you are getting into too much. If you've tried everything else that may be the best place to start. Another thing to consider is that axle wrap could be causing all of this. Especially since you describe the issues being exacerbated when you are on the accelerator. I've read to test wrap engage the parking brake, put vehicle in 4 lo, and accelerate moderately. Have a buddy do this while you watch the axle. You could be wrapping from 3 degrees to something more undesirable when in the skinny pedal.
 
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Andy over at tarheel 4wd has it now. I gave up. We were thinking that since it is a rugged ridge unit there could be some issues with the trueness of the output shaft. . He says on xj's you can normally be 1-3* off on pinion angle and be fine due to dshaft length. We will see. Took off the 33s and dropped it off with 235s on it to eliminate tire noise. Looks pretty goofy
 
hopefully. its going to be atleast 3-4 hours of labor...so thats an auto $240-300. If an untrue output shaft rugged ridge sure will get a piece of my mind
 
check diff bearings. backlash. when you let off throttle pinion has no pressure and will coast with ring gear. when you accelerate pinion will wonder.
 
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