Ring and Pinion install price?

when i had a shop we used to do r&p swaps in the newer mustangs (same general type of axle) and generally charged around $400 in including gears/setup kit. it usually takes an hour or two to properly set one up as long as you don't run into any problems. your shop should be checking everything with a dial gauge and it needs to be right on for that price. if possible you should hang out and watch how its done, its really not very difficult, special tools required are an impact wrench and the aforementioned dial gauge. other than that once you learn how to do it, it can be done in the garage or carport with ease.
-tim