Also purchased precision gears from Reider for my Mustang. Don't know what trans you have but I went from 3.00 to 3.70 gears with a C4 automatic and am very happy with them. They were extremely helpful on the phone when I ordered the parts. As soon as I told them my application they set me up with everything I needed for a complete overhaul (bearings, shims, etc.). You can see a picture of the overhaul with the fresh set of gears in my hotrodders photo album. I give Reider Racing two thumbs up.