Not really sure how to explain what I'm hearing or how long it's been going on, but I'm getting some sort of whining noise while my rig is in motion.

Doesn't seem to be coming from the engine bay and doesn't occur unless my Jeep is rolling (with or without the gas pedal). Its a high pitched whine that seems to be coming from the underside of the Jeep. At first I was thinking my breaks were rubbing on the calipers, but I don't think that's it. Don't want to open up a can of worms, but I did get a set of 5.13s installed a little over a year ago, but this whining noise is recent.

btw, it seems to get louder with speed. The faster I'm rolling, the louder the noise until around 55 or so; then the road noise of the tires/wind take over...

any help or opinions are much appreciated!

 

since you just re-geared, and some new gears will whine, make sure your difs have prop amount of lube - also check the entire driveline for anything loose. (bolts, bad angles, rubbing etc.) if you can just put it in neutral (engine off) and roll it around to eliminate any external engine or hydraulic noises. get a buddy to do this while your outside the jeep and try to isolate the sound. hope this helps!

 

Thanks for the advice. I'm going to start trouble shooting this weekend.

Anyone else feel like chiming in?

 

If you run aftermarket drive shafts make sure they are greased and don't forget the needle fitting for the CV ball. When that goes dry it makes a high pitched squealing noise or chirps.