Speedo is off! Need help. - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 08-15-2011, 08:48 PM Thread Starter
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Speedo not reading correctly! Need help.

Dont know if this is the right section but I have a question. I just bought a 03 f350 and the speedo is off a few mph. I have checked it with 2 different gps units. It has the factory tire size but the speedo reads slow. at highway speeds it is off as much as 6 mph. Around town its off about 2-3 mph.


Is this normal or what can I do?
Also how much is this affecting my mileage on the odometer?

03 F350 CCLB 4X4 6.0L 81k New to me on 7/22/11
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4" lift waiting to go on, 35's, exhaust, 05 Front End, Coolant Filter



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Last edited by one5oh2nv; 08-15-2011 at 09:00 PM.
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post #2 of 5 Old 08-15-2011, 08:49 PM
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that title........




anyway

what tire size are you running?

2006 Ford F250 CCSB FX4 6.0

Sold
1997 F350 CCLB 2WD 7.3
1999 F350 CCLB 4WD 7.3
2003 F350 CCLB FX4 6.0



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post #3 of 5 Old 08-15-2011, 08:53 PM Thread Starter
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265/75/16

Whats wrong with the title?

03 F350 CCLB 4X4 6.0L 81k New to me on 7/22/11
For Now
ScangaugeII, Fog Light Mod, High Idle and fresh fluids!
Soon
4" lift waiting to go on, 35's, exhaust, 05 Front End, Coolant Filter



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post #4 of 5 Old 08-15-2011, 10:12 PM
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Quote:
Originally Posted by one5oh2nv View Post
265/75/16

Whats wrong with the title?
Lol nothing.


Stock size huh? Then someone musta change the computer tire cal.

2006 Ford F250 CCSB FX4 6.0

Sold
1997 F350 CCLB 2WD 7.3
1999 F350 CCLB 4WD 7.3
2003 F350 CCLB FX4 6.0



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post #5 of 5 Old 08-18-2011, 01:20 AM
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Almost all speedos will be off from the factory. Most will read that your going faster then you really are. the speedo if im correct is controled by the ABS i know they make aftermarket modules to correct them for larger tires but i have never messed with them to see how they work.

2005 f250 cc 4x4
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