Quick Shot xMLx

Hey guys I'm here asking for a friend. He has a New Edge GT and wants to get some gears installed and his differential rebuilt. I'm looking for a good place within an hour of Charlotte that can handle both. I know most places do gear swaps but I don't know how much more difficult it is to rebuild the differential. Looking for a place with a reasonable price, I know the going rate for gear swaps around here is $200-250(well it was 4 years ago when I had my GT lol) but no idea how much more money the rebuild costs. This is with him(my friend) providing everything, the gears, new bearings, and the rebuild kit.