i am about to replace the front rotors and also replace the compressor, which requires i pull the lh drive shaft. on the while you are there front, i have no present reason to replace the cv shafts and i don't know if they are oem and worth repacking, but i was thinking i might rotate them. i know that can gain some life with regular birfields on an 80 by doing that. any thoughts on whether it will extend a 100 series birf life?