05 jeep liberty

So, I've been told by a local mechanic that my rear end is going out. No other information. A weekend wrench buddy told me he thinks it more bearings etc. Symptoms include: Very loud whirring sound when going forward, reverse at minimal speed; no sound. No visible leaking around transfer case...

Howdy everyone, my 05 jeep liberty had been releasing a freon smell when I would turn off the cold air button. My liberty kept running out of freon for a whole year now. After frequent vacuumes and freon refills, I have not found the leak anywhere under the hood. My next thought would be that...