Hey guys. Quick question. I have a 2004 tacoma prerunner v6. Double cab. It has 116k on it. Runs great no problems at all. Since I've had it at 67k miles if never done a rear dif. Service or a transmission service. It runs great. I heard if it runs good don't change it. Should I have it done? Called Toyota today 80 for the dif. And 179 for the transmission service. What you think ?