Rear Gear Change
 

I recently changed the rear in my 99 Cobra from the stock 3.27 to a 3.73 ratio. How do I recalibrate the speedometer. The mechanic said the speedo uses a magnetic pickup and not a toothed gear at the transmission. Reprogram the computer???

you have two choices. you either have to have a chip thats programmed for the 373 gears or you can buy a calibration box. i think thats what its called

Call Dallas Mustang and see if they have a Speedcal to fit your Cobra.
Be sure to say whether you're using a stick or AODE. www.dallasmustang.com

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Adam "Hammer" Packett:
Moderator, Gulf War Veteran
http://www.mustangworks.com/~hammer/navy.gif GO GET 'EM BOYS! http://www.mustangworks.com/~hammer/f-14i.gif

Thanks for the tip. The speed cal box is just the thing. Sorry you told me about Dallas Mustang, could cost me a lot of money. They got some nice toys!