Ok, first off, I'm new to this forum, and even though I've owned my Discovery for a few years now and I'm mechanically inclined when it comes to cars, I've never diagnosed nor have I really done any work to this truck. It's a 1996 Dicovery, automatic trans. As of last week I've been hearing a loud humming noise coming from the front of the truck over 40MPH, it's gotten worse since then. Now I've been experiencing a clacking noise when I would put the truck into reverse for a while now, and the driver side front CV joint has gone on me in the last few days. I was wondering if this was a common issue with these trucks, and also if any of you would know what could be causing this humming. I'm hopeing it's just a drive shaft, or the wheel hub, but I really dont know, and I wanted to get an idea of how complicated is would be to properly diagnose and fix this issue before I go and start taking things apart. Any help you can give me would be greatly appreciated.