• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' the posts that you read.

2009: 3.73 to 4.10 speedo off


Ferris Bueller

New member
Joined
Aug 15, 2007
Messages
131
Reaction score
0
Points
0
Age
39
Location
Near St.Paul
Transmission
Automatic
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.
 


Rock Auto 5% Discount Code: 4FF3E9EEA14805 Expires: October 1st, 2020

adsm08

Senior Master Grease Monkey
Supporting Member
Article Contributor
Ford Technician
TRS 20th Anniversary
Joined
Sep 20, 2009
Messages
33,791
Reaction score
2,903
Points
113
Location
Dillsburg PA
Vehicle Year
1987
Make / Model
Ford
Engine Type
4.0 V6
Engine Size
4.0
Transmission
Manual
2WD / 4WD
4WD
Tire Size
31X10.50X15
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

Well-known member
Joined
Jun 30, 2013
Messages
1,365
Reaction score
73
Points
48
Location
AZ
Vehicle Year
1993 & 1994
Make / Model
Ford
Engine Size
2.3l & 4.0l
Transmission
Manual
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

11/2014 OTOTM Winner
OTOTM Winner
TRS Banner 2012-2015
Joined
Mar 14, 2013
Messages
1,826
Reaction score
24
Points
38
Location
Texas
Vehicle Year
2007
Make / Model
Ford
Engine Type
4.0 V6
Engine Size
4.0L SOHC
Transmission
Automatic
2WD / 4WD
2WD
Tire Size
31
My credo
I need more sleep.
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.
 


Top