Yep. CV joint is failing. Front drivers side. I knew the boot had failed some time ago, but was too cash strapped (and lazy) to fix it. Now it's making noise, even on the straight-aways. I'm gonna have to replace it tomorrow. Probably just get a new (rebuilt) half shaft. Oh well. at least right now I have a little set aside for just such emergencies. :-\

I had one making noise while driving straight a few years ago. It would quiet right down if I stuffed some grease into the joint by hand. Eventually replaced it. Actually that was the time I had a brand new aftermarket axle blow to pieces on me about 100 yards after installing, it was awesome.

 

Had one making noise while driving straight this summer too. Again I kept stuffing grease in it and it would quiet down. Folks will hate that I mention this but since the grease would quiet it down I figured why not put a new boot on it and see how long it lasts? So far so good, I put a new boot on it in my lifted XT6.