speed-cal install question

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Depending on how high the curbs are where you are at you can drive your drivers side front and rear tires up on the curb. It will still be a tight fit, but I've been there and done that.
 
The speedcal will work in an auto equipped 97 GT.

A speedcal looks like a box with a large wire running out of it. It allows you to keep your odometer and speedometer accurate when changing rear gears and tire size where a chip or tune cannot.