Engine, rear gear, Tourque Converter, Tire size info/question for the experts

Hey Nick, with your 904, 3500-stall converter, 3.73 gears, and 24¼” tires, it’s normal for the car to feel rev-happy and blow through gears. The high-stall converter launches the car aggressively, and the 3.73s just keep RPMs up.
Dropping to 3.55 or 3.62 gears would lower RPMs and make it feel more balanced, especially if you can go slight taller on the tires in the future. If you stick with 3.73 and the current tires, it’s always going to feel high-rev. The combo isn’t bad, just a little aggressive for daily driving.