So I bought a set of 4.10s from mustang tuning today. Bought the master rebuild kit as well that was recommended. Called JT's performance todayand just for installation he quoted 500 bucks!!! that is simply just over kill. I called Throttle Stop and they quoted 400 bucks. So I then called jaws gear and axle they quoted 320. I've heard this isn't super hard to do. I mean granted i know things are done but people come on does this seem fair. I just wanted to get some imput before I go and have a shop do them. Im going to shop around some more. Any suggestions in or around the sacramento area?