I charge between 600-650 labor for 2 axles. Depending on what they are. If its a toyota or 9" and you bring me the 3rd, its only 150. now I have about 5k invested in tools just for doing differentials and I have done hundreds of them, possibly in 4 digits now. But im not going to back my prices down because some guy watched a youtube video. Thats barely turning a profit. Also note that about half the builds i do are to correct a diy job.... At that point that usually spend twice the money they would have if they had just brought it to me to begin with. Im in birmingham if you want me to have a look at yours