Ok. I've done the search thing and I noticed that a couple of you guys have replaced your axles. Well, I've got that dull thumping going on back there. Especially when I make right turns. So, I have two questions. First, how hard is it to actually change them? Could it be done in my garage? What tools are needed? Another question is how long can I let this go. I do plan on changing them both. I figure if one is out it's just better to change both. Kind of like headlights and brakes. It's been doing this for about 6 months now. No increase in noise, no other sign. I looked under there and both boots are in tact. So, how long can I leave it like this?