Re-Calibrating Speedometer??
#1
Re-Calibrating Speedometer??
First off this is NOT for my SuperDuty.
It IS for my '03 Ranger 3.0 with 5speed AUTOMATIC trans.
I bought the truck in October and discovered it has the (optional) 4.10.1 gears.
I see absolutely NO reason to spin this little engine at nearly 3k rpm
at highway speeds.
I have my F350 7.3 S/D for any heavy hauling I need to do, the MOST weight I'd ever tow with the Ranger would be around 1k lbs
I'd like to swap to a 3.55.1 gear AND recalibrate the speedo.
I have asked on the Ranger forum how the re-calibrating is done nowadays-back in the day we used to just change the plastic gear on the end of the speedo cable.
No one seems to know......
It IS for my '03 Ranger 3.0 with 5speed AUTOMATIC trans.
I bought the truck in October and discovered it has the (optional) 4.10.1 gears.
I see absolutely NO reason to spin this little engine at nearly 3k rpm
at highway speeds.
I have my F350 7.3 S/D for any heavy hauling I need to do, the MOST weight I'd ever tow with the Ranger would be around 1k lbs
I'd like to swap to a 3.55.1 gear AND recalibrate the speedo.
I have asked on the Ranger forum how the re-calibrating is done nowadays-back in the day we used to just change the plastic gear on the end of the speedo cable.
No one seems to know......
#2
Join Date: Jun 2003
Location: Damon (South East Texas)
Posts: 8,298
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There are inline electronic modules that can be installed/adjusted to change the pulse counts of the VSS as read by the PCM. You may want to look into this option. Here a couple I have found: Superlift Truspeed (limited availability; I believe the #33002 is for your app) and Classic Instruments SN74 (available; universal). There are both shown in the Summit Racing online catalog. I was looking at the Truspeed modules before the Auto Enginuity was available with the tire size calibrator. I ended up using the Hypertech Speed Calibrator, but it is not available for your Ranger. Hope this helps.
#3
#4
Not sure........I was told that a dealer can change/calibrate the speedo with THEIR computer.......not sure if this is true either......
#5
#6
I can make your speedometer work correctly with the new ratio sitting here at my computer. DONE. Go ahead and change the gears. The speedo will be exactly as accurate with the new ratio as it is right now.
The Vehicle Speed Sensor (VSS) reads the rotational speed of the rear axle shafts. Changing the rear axle doesn't change how fast the axle shafts rotate for any given speed, so the reading on the speedometer won't change when you change gears. If you change tire size you have to recalibrate the speedo, but not when you change gears.
The Vehicle Speed Sensor (VSS) reads the rotational speed of the rear axle shafts. Changing the rear axle doesn't change how fast the axle shafts rotate for any given speed, so the reading on the speedometer won't change when you change gears. If you change tire size you have to recalibrate the speedo, but not when you change gears.
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#9
Join Date: Jun 2003
Location: Damon (South East Texas)
Posts: 8,298
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It is my understanding that a '93 Ranger uses a Speed Sensor in the tail of the Transmission/Transfer Case to read the Output shaft speed. A separate (ABS sensor) was used on the rear differential to read axle speed for the braking system. Wouldn't the ratio affect the speedometer accuracy due to it changing the Output shaft speed by speeding up, or slowing it down, at a given axle speed?
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