Speedometer

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03-24-2014, 08:43 AM

oldmare

Thread Starter

Join Date: Mar 2014

Location: Nebraska

Posts: 1

Speedometer

Just purchased a 2003 GT Premium Convertible. Don't have any documentation on it. The problem is the speedometer shows 70 but I'm radar shows 60. The tires are stock size. I need help to fix this please. Thanks

03-24-2014, 01:57 PM

poxenham

Join Date: Mar 2014

Location: California

Posts: 16

Sounds like you either have aftermarket wheels or a different diff gear (or both).

You need the ford racing recalibration tool part #M-4209ADPT-AC. Can be purchased from AM here

03-26-2014, 01:36 PM

WhiteFaleen2001

2nd Gear Member

Join Date: Jul 2006

Location: California

Posts: 487

I would go through the gauge test to verify the computer reading of speed.

03-26-2014, 01:37 PM

cliffyk

TECH SAVANT

Join Date: Dec 2006

Location: Saint Augustine, FL

Posts: 10,938

The final drive gears were changed to 3.73:1ratio, from the stock 3.27:1 gears. The speedometer correction device linked above, or a custom tune can correct this--I'd go with a tune as the stock tune sucks...