They SHOULD charge you 2-3 hours of shop time. Lots of places like to try to charge a LOT for gear changes though. I've been quoted up to $700 for just the install before. That's when you make sure to laugh in their face and walk out the door.
2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.