66falcon
 |
|
• saint louis, MO, USA |
|
• Registered on 6/10/2016 |
|
• 1 post |
• 1
|
|
 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
|
|
|
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. |
|