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Thanks for the other suggestions. I’ll get them checked as soon as possible.

Yes, I have checked all my driveline fluids. The rear axle took almost nothing to top up, while the front axle and t-case were at the right levels. The rear axle has that weird rubber cover for topping up fluid, and that was the only area of the axle that showed any signs of slight leakage.

No clunk. The hum is there constantly when moving. It just intensifies in loudness and deep tone when speeding up. I’m putting it up on jack stands today to do some more diagnosing. Thanks for the ideas.

Im trying to get a good idea of where to start taking stuff apart, on my dad’s 2007 Liberty. I have a deep hum coming from the rear somewhere. It only start when on the move, and increases in intensity and depth as I speed up. I couldn’t reall tell if it was on one side or not. I’m...