Vibes after SYE and shims. Need help.
 

I have a 97 Jeep Cherokee 4.0. I put an AA SYE in back inNovember and I am using a front driveshaft out of another Cherokee. I have hadsome vibes since then but nothing too bad. After my last outing it seems tohave gotten worse. My motor mounts were shot so I replaced with OEM mounts bc Ididn’t have the money for Brown Dog at the time, hoping that would fix thevibrating wheel. It did fix it some but not completely.


I also had 4 degreeshims that I had not installed yet, but I installed them this weekend. Itcontinued to have real bad vibes at around 40. They are enough to make thesteering wheel shake. Once I get up to 50+ it starts making a loud roaringnoise that gets loud as I go faster. It does not sound like wheel bearings oranything like that. Once I let off the gas that sound goes away then picks upwhen I get back on the gas. Does anyone know what would cause that? I replacedthe Ujoints on the driveshaft before I put that one in. It sounds to me likesomething from the driveshaft. I am saving up to buy a custom shaft but I wantto be sure that is what the issue is before I drop the money on it.

Thanks

Was 4* shims what you needed or did you just guess? A degree or two off can cause driveline vibes. What you describe sounds like driveline vibes but the shaking could be something else... Tires, balance etc. Could be front shaft. Can pull that and take a drive and see.

The 4 degree is what i measured. It had done it before i put the shim in also. Before it started getting worse, i took the rear shaft out to see if that was the cause of the vibes and it was.

Sounds like a 2 degree shim is what you need.... so you have a 4 degree split between your pinion and driveshaft from being parallel ? 2 degree should put you right within range

Roaring and shaking wheel getting worse after wheeling. Sounds like hub bearing to me. I was hunting a vibration and that's what mine ended up being. To test you could pull the rear driveshaft and put it in 4 hi and drive around, not forever but to see if it still has vibrations.

had the same problem and it ended up being a spent shaft. switch it with your front and see if its the same.

Well took it off and ran with the front only this weekend. It had zero vibes so i switched the front to the rear and good as new! Looks like i may have to save up for a custom shaft!
Any advice on what to get? I have heard a lot of good about Tom Woods. Also best place to get one?

I'd just grab one from the junkyard for now or rebuild the one you pulled.