firazza

My 2013 mustang V6 automatic is reading a wrong speed in odometer.. I've just upgraded the rear axle from factory to 3.73 (ford racing) and I don't know what is going on and/or how to solve it
does anybody know what to do? there are no dealers nearby me, that's why im askinge dash

Thanks!

2011V6Nicole

you need to have the ecu flashed or if you have a hand held tuner you can adjust the settings yourself

MustangInTexas

If you're reading the speed off the odometer, it'll never be right. Besides that, what Nicole said.

cruisin5268d

I just spit my water out on my keyboard. Thanks for that.



OP, you changed the gearing of your powertrain system. Of course the speedometer will be off. You need to get the ECU flashed as has been said.

Nuke

With the handheld, you can select which gears you have to adjust the PCM. You may as well order a custom tune with a the handheld tuner and pick up some significant RWHP. And if you ever change tires/wheels, you can adjust the tire revs/mile with the handheld,too.

firazza

Thanks everybody for the answers

Which is the best equipment I could buy? Bama is good option?

2005Redfire6

Yeah, that will work.

Siber Express

His Portuguese to English Dictionary might have misled him, it appears he is in Sao Paulo Brazil.

oldfella

I have a 3.73 gear now in my 92, and have not installed the speedo gear kit. My mph are only off by 3mph, according to my GPS. I'm running 62 when the speedo says 65, if my gps is right.

firazza

^^ The speed at my odometer is too much different, when I am at 130 kmh / 80 mph (by the GPS) the odometer shows that I am at 180kmh / 110 mph, and the car cannot go faster than this.