now i'm not sure if its the axle, but seems like it tho. when i put my car in reverse and as the car moves back i hear this click noise, not clicking but just a loud click. what could this be? it doesnt seem to bother me while i'm driving, but just need to know if its something serious. thanks in advance.

 

Sounds like your wheel hub needs to be re-torqued. There is a TSB for this problem and it basically involves removing the wheel hub nuts, regreasing the area around it and tightening the nuts with a higher torque rating. Search for 'wheel hub TSB' and you should find other info.