I have a 15 GT performance package. I'm looking to find out what would be a good price to have a new ring and pinion gear installed would be? I know the ford racing gears are around $185. I just got a quote from Livernois Motorsports for $2215. That sounds absurd. The guy said they'd need to do a complete custom dyno tune on the thing. What? Pretty sure I can go in my diablosport tuner and just select a different gear ratio.