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Message: <blockquote data-quote="Cathy9888" data-source="post: 1512018" data-attributes="member: 29702">Did some more research and think the prior owner swapped the 97 tranny with a 99 T45 using electric speed sensor.  That is my best guess since things are not adding up like a 97. Going to install a new 99 electric sensor and see what happens.  If the speedometer works, hopefully the variance isn't bad. Found the TREMEC stamp plus what looks like 6AE 383 on the tranny.  Maybe those match the vin of the car it came from.?  I could not find the tranny id tag so it must have been removed.Between 1996 and 1998, T-45 transmissions from Mustang GTs used a seven-tooth speedometer gear, though Cobras used an eight tooth speedometer gear. In 1999, both the Cobra and GT T45 were moved over to an electronic sensor speedometer. [URL unfurl="true"]https://www.cjponyparts.com/resources/t-45-transmission[/URL]</blockquote>