2009: 3.73 to 4.10 speedo off

[Ferris Bueller]

My brother and I swapped out the stock 3.73 7.5 axle out of my 2009 Ranger 2wd 2.3 5 speed regular cab and installed a 4.10 7.5 axle out of a 2006 Ranger 2wd supercab that had 2,600 miles on it when it was totalled. Now my speedo reads 67-68 mph when I'm going 60 and the odometer reads 11 miles for every 10 miles I drive. I called a local dealer and they said the calibration is in the computer. Among the four dealers I called I got quotes of $110 to as much as $250 to change it. A few of the dealers sounded confident it could be done in one hour. By chance is there a tool I can rent to make this change? I have no plans to mess around with larger tires or other mods since I have several sets of extra wheels and tires for my 2009 & 2004 identical Rangers.

 

[adsm08]

There is no tool to rent. The fix is to change the calibration file in the instrument cluster to correct the numbers it is using for the gear ratio, so the math it is doing it right.

You can buy a tuner that does speedo correction for $300+ or you can take it to the dealer to get the gear ratio the computer thinks it has changed. It can be done fairly easily with a factory scanner, and it is pretty standard to charge 1 hour labor for customer-pay programming updates.

 

[black_demon69]

My brother and I swapped out the stock 3.73 7.5 axle out of my 2009 Ranger 2wd 2.3 5 speed regular cab and installed a 4.10 7.5 axle out of a 2006 Ranger 2wd supercab that had 2,600 miles on it when it was totalled. Now my speedo reads 67-68 mph when I'm going 60 and the odometer reads 11 miles for every 10 miles I drive. I called a local dealer and they said the calibration is in the computer. Among the four dealers I called I got quotes of $110 to as much as $250 to change it. A few of the dealers sounded confident it could be done in one hour. By chance is there a tool I can rent to make this change? I have no plans to mess around with larger tires or other mods since I have several sets of extra wheels and tires for my 2009 & 2004 identical Rangers.

look at ERA at the bottom of page it may help you
http://www.transmissioncenter.net/speedometer_calibration_______va.htm

 

[MastuhWaffles]

I had 3.55 gears and when I added bigger tires it made the speedometer go faster than it was, but then I added 3.73 gears and that put it back to normal.