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Right on. Thanks.

If I'd have known how simple it was to do I'd have had it done last January. I'll get out on the interstate and do some some miles to see just how close I got it. Sure glad I don't have to invest in bigger diameter tires.

I figured it out! The problem with using the SCT Tuner was that I was using the wrong tire Rev's per mile. The SCT tuner isn't really designed for my Ranger (more for a Mustang) but it does work - to a point! I only used it to change the gear ratio, and left everything else as is - specifically...

Ford says they can't do it. I didn't ask if they meant THEY, my local dealer, can't do it, or it can't be done, period. Next time I'm there I think I'll ask that! I may be flogging a dead horse.

You are right, and I may need to do it again after new tires. But I pretty much know the problem. It's the solution I'm having trouble finding. The TruSpeed device worked perfectly on my '96 Ranger. One of Ford's "better ideas" seems to be making vehicles which can't be altered mechanically to...

In my area the roads are quite twisty and mile markers aren't always present, or consistent when they are. Only place they are accurate and consistent is on the interstate - and I try to stay off that unless I absolutely must be on it.

I have a GPS that measures miles and speed. But I'd prefer the gauges did it. The GPS only stores trip miles if I leave it plugged in, which is a drain on the battery.

My gear change netted me a 3-4 MPG increase - and little loss of HP that I can tell. I'll sacrifice a bit of that for guage accuracy.

My swap definately affected speedo/odo readings

My idea, if i can't calibrate the Speedo/odo any other way, is to go from my present 235x75x15 to something with a bit larger circumference - figuring they will roll farther per revolution and get me closer to speedo/odo accuracy! The gear change netted me an average 3-4 MPG increase - or around...

Its an automatic. No speedo gear. All electronic.

I've read it comes from the OSS - output shaft speed sensor, or the ABS Sensor, or the rear axle speed sensor. I've tried each of those with no luck! I haven't tried the wss. But I haven't read anything to indicate they are the source. I'm thinking that larger dia. tires might do the job?

I looked into that but it looks to be way over my head. Not to mention, I don't have a laptop - or a smart phone, for that matter. My tire size is OEM. It's the gears I've changed.

I found your forum while searching for a way to calibrate the electronic Speedometer/odometer on my '09 ranger. I changed the gear ratio for better mileage and I expected to be able to re-calibrate the speedo/od to reflect the change, but so far no go. My previous truck was a '96 Ranger. On it I...