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Resident Headbanger
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2,451 Posts
Sounds like the previous owner did a rear end gear swap but didn't correct the speedo. The degree of speedo error that you have tells me that the stock gear was a 3.08 and you now have a 3.73. You have two choices to fix it:

1. Install a Dallas Mustang Speedcal and program it to a 3.73 gear.
2. Replace the 8-tooth plastic drivegear on your T5 output shaft with a 7-tooth drivegear, and replace the stock 20-tooth speedo gear with a 21-tooth speedo gear.
 
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