Grinding vibrating when it dips
 

OK, had my 2001 4x4 blazer dropped for a few years now. Been great.

The last couple of months when I hit a dip in the road at highway speed the right front makes a grinding noise. I have had it apart and nothing is rubbing. Not the tire or any signs of contact. There is a little vibration all the time now as well. really bad when the front dips though.

Any ideas what can cause this?

Thanks

So no one?

Hub maybe bad

wheel bearing?

Lowered a perfectly good 4X4??? :icon_doh:

Front or rear driveshaft hitting something, binding/stiff universal joint, half shaft rubbing on something, worn CV joint? All of which are possible when you lower a vehicle. You're asking it to do things and operate under conditions that it was not designed for.

Yes i did. The front DS is out now. It does not move for IFS anyway. My guess is a hub as well. Just a strange thing. Was smooth as silk for almost 2 years then this.

The bearing(hub) may have finally worn enough that the rotor is contacting the backing plate or other part.

Please explain.

he means the front drive shaft is stationary.. the differential is solid mounted... unless he bent something nasty the shaft should not hit anything even if it is lowered.

Correct me if I'm wrong here: The transfer case and the front differential are mounted to the chassis. When the body jounces and rebounds, both driveshafts and both half shafts move up and down independently. If the body is lowered, something could easily contact any of them. Same holds true if front chassis ride height was lowered out of spec. Over time, not miles, torsion bars lose their lift allowing the body to drop lower.