Speedometer

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Mar 24, 2014 | 08:43 AM

oldmare

Thread Starter

Joined: Mar 2014

Posts: 1

From: Nebraska

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

Mar 24, 2014 | 01:57 PM

poxenham

Joined: Mar 2014

Posts: 16

From: California

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

Mar 26, 2014 | 01:36 PM

WhiteFaleen2001

2nd Gear Member

Joined: Jul 2006

Posts: 487

From: California

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

Mar 26, 2014 | 01:37 PM

cliffyk

TECH SAVANT

Joined: Dec 2006

Posts: 10,937

From: Saint Augustine, FL

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...