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Message: <blockquote data-quote="gregbar" data-source="post: 690398" data-attributes="member: 12608"><p>I have heard from several sources that the 23 teeth speedo gears get chewed up. FORD offered speedo drive gears in 6,7 and 8 teeth. The speedo gears are offered in 16,18,19,20,21and 23 teeth. They are all color coded. By measuring the OD of your tire and knowing your gears you can figure out which set to use. Go to hanlonmotorsports.com/T5speedo put in the info get your set. I took out my drive gear from the tranny and swapped to a 7tooth and a 20tooth speedo to get mine right. Im running 373 with 255 45-17.</p></blockquote><p></p>