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Message: <blockquote data-quote="SPeace-ATL" data-source="post: 1577396" data-attributes="member: 36465">CAUTION!!! For a 96-98 GT T-45 the internal gear is the 8-tooth which is only good for calibration up to a 3.27 differential with nominal tires.A 3.55 or 3.73 or 4.10 will require a Speed Calibration Device to be installed to get the speedometer accurate.The references to any speedometer "driven" gear on the VSS with more teeth than 21 are all aftermarket gears that will work, but only for a few months before it chews off all the teeth.These 23 tooth gears referenced above will also eventually ruin the internal speedometer gear rendering the speedometer drive useless until the gear is replaced inside the transmission.The 23t gears mentioned are TRASH.  I have a collection of them in my junk bin that I have removed from transmissions over the years.  They should not even be offered...  The gear teeth have to be paper thin to get 23 teeth around the gear.  No GOOD!The 96-98 COBRA T-45 has a 7-t internal gear that will calibrate up to the 3.73 differential without a Speed Calibration Device.  If you can get your hands on a 7-t internal gear the transmission tail section still has to be opened in order to install it. For Reference, the 1999-2001 T-45 transmissions have an electronic "OSS" speedometer pickup.  Those are calibrated electronically in the programming of the "tune" of the ECM. Stan</blockquote>