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Speedometer re-calibration

Tiny
V8RALLYRANGER
  • MEMBER
  • 2006 FORD CROWN VICTORIA
  • 4.6L
  • V8
  • RWD
  • AUTOMATIC
  • 150,000 MILES
This is a P71 dash cluster and I would like to know how or best way to reprogram the dash cluster to read correct mileage on speedometer and odometer using a NGS or other like tool or where to go or how to get this done. There was a rear end change from a 2.73 to a 3.73, so I am thinking with the change it would be good for the VSS to be accurate. And so the shift points and speed and mileage would reflect the actual. Can you help?
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Saturday, July 8th, 2017 AT 9:54 AM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
A dealer has to reprogram the dash and PCM due to the rear end change of a different gear ratio. they are the only ones that are able to do that.
https://www.2carpros.com/articles/how-a-differential-works
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Saturday, July 8th, 2017 AT 10:40 AM
Tiny
V8RALLYRANGER
  • MEMBER
  • 2 POSTS
Funny how the local dealer says they cannot and if have to send cluster out cause it is a cop car. I have worked for Ford dealers for twenty years. And what there telling me is false. I know an NGS can do that. And it is not difficult heal I ghave done it many times mostly on SUV'and pickups. Granted never did it on a p71. But thank you.
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Saturday, July 8th, 2017 AT 12:24 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It may be the people that work there, the dash speedometer is VIN number protected so it may be a little harder with a cop car.
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Saturday, July 8th, 2017 AT 3:33 PM

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