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Message: <blockquote data-quote="Kris" data-source="post: 490615" data-attributes="member: 10928">Manual Transmission: For a 4.10:1 axle ratio with 25.25 inch diameter tire and 7 tooth drive gear, you'll need a 23 tooth driven gear. Your speedometer will be incorrect by about 0 percentAfter a few minutes of trying out different tire sizes and drive gear sizes, this is what I need.I know one of the gears is stripped. At WOT, the gear reads about 10mph slower than it should and gets worse as the car goes quicker.The tires on the car are the same I've have, 255/50/16 ET Street Radials. These are 26.1 inches in diameter, I'm hoping by dropping some tire pressure, I can get to that 25.25" that I need.So, I saw a write up on installing the driven gear, looks really easy.. The drive gear on the other hand, I'm not sure about.Anyone even installed a drive gear and have any feedback on how tough this is to do?The trans will stay installed... I'm not about to drop the trans to install the drive gear, I'll just put up with it LOL</blockquote>