has anyone had to replace their drivers side front axle shaft assembly? i had a damaged cv boot and all the grease leaked out causing some thud at low speeds. i had the boot replaced and now it is still making noises at low speed. i think i need to replace the axle. the shop was going to replace it for free after the new boot they installed wouldnt stay sealed but they couldnt pull it out of the differential housing. anyone know why?