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Forums > Car and Truck Make and Model Specific > Crown Victoria, Marauder, Marquis

tuning

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66falcon • saint louis, MO, USA • Registered on 6/10/2016 • 1 post • 1 Vehicle	Posted:6/10/2016 05:35 can rear end gear ratio be changed in the ECM??
hondaclf • Baldwin, NY, USA • Registered on 2/25/2009 • 244 posts • 4 Vehicles	Posted:6/10/2016 07:10 Yes, what year and to what?
kb2enj • Maryville, TN, USA • Registered on 6/14/2011 • 21 posts	Posted:6/10/2016 08:09 The short answer is yes. After 2003, I believe, the only way to change the rear ratio is in the PCM. A few years ago I had purchased a 2003 Grand Marquis LSE. The speedometer was reading high. ( can be verified with a portable GPS) The standard GM and the LSE model use different rear ratios. I looked at the PCM and it had Yellow "junk yard writing" on it : Crown Victoria. I sent the PCM to Flagship One (516 766-2223) . They reprogramed the PCM to the factory data for my serial #. That fixed the speedometer problem. I believe they charged me $55.00 plus shipping.

Forums > Car and Truck Make and Model Specific > Crown Victoria, Marauder, Marquis

tuning

Thread Statistics:     Users to Post: 3   |   Total Posts: 3   |   Total Views: 349

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