It takes a good mechanic approx 3-4 hours - so multiply that by the shop's labor rate which will vary across the county. In California, figure $70 to $100 per hour. My 2002 GT gear swap (to 3.73s) cost me $175 on a "special" advertised deal but my recent 2005 GT gear swap (to 4.10s) was closer to $275. I don't have the skills nor the tools and what's the fun of having to blame yourself if the new gears whine? I made sure the guy doing the work had done several '05 models before mine and I supplied the Ford-built ring & pinion set (made sure the part number has an "A" at the end of it, not a "M" for Motive-built). It went well and I'm very pleased with the work and the result. Along with the MGW Shifter, the new gear set greatly improved my driving experience. So good luck with your project!