went to get my tires rotated today when the tech noticed there is grease comin out the axle on the left side. is this really bad? how much does it cost to replace an axle?

 

Is the grease coming from the cv boot? If so you may just need to replace you boot.

 

if it is coming from the boot, replace ASAP. The boot is there to keep foriegn debris out of the joint.
Ive temporarily fixed small rips in boots w/ RTV. You must get it clean though and let it dry before using ie. 2 hours or so.
this will buy you time to buy and install new boot.

 

thanks for all the help and yes it is coming from the boot. so i don't need a new axle? its just the boot is ripped or soemthing right?

 

Boots are biatch to replace. I'd just go get a remanufactured axle from Pep Boys or Napa or somewhere. They're $80 w/ core, comes with all new boots and bearings, you just pop it in and bring back the old one.