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?
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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