the 30k quoted by toyota is for the CV axle assembly which includes the inner,outer CV joints ,and axle shafting.Usually the outer CV joints are replaced when a continous knocking sound is heard when turning .This is what happened to my 2003 1.6G Altis. The bearings were damaged .The mechanic said the reason for the damage was the teared of rubber boots which caused the dirt to go inside the bearings and the grease spilled out.The outer CV was replaced with FEDERAL MOGUL brand cost about 1800.Option was the Japan HDK brand but more expensive around 2400. Had mine done at ZEE CARPLUS along aurora boulevard ,San Juan. Big savings.....