2001 Cobra Speedometer recalibration

I have been doing some reading and I am confused as to how the speedometer is re calibrated on the 01 Mustangs after a gear change. I changed my stock 3.27 ring/pinion to a 4.10. I know I should just buy a tuner but my wife is convinced I dont have $400. (The gear change cost me $950 more then I anticipated because I replaced all the bushings etc. back there that were wore out while I hade it apart). So I guess I have two questions:

1. Can the dealer hook up their computer and just go in and change it? They quoted me $55 for this but did were not sure if it was a programmable parameter.

2. What does a Speedcal do and why would you use one of these if you can just use a tuner or computer to change the ratio?

Thanks in advance for any light you guys can shed on this.

As far as I know they still have the gears, it might be an electrical connection but it's off of the tailshaft. Go pull the sender out, it's 1 bolt and an O ring. Then you can shine a light inside and see what color the gear on the output shaft is, and also see what color the gear you have is. Then go to LMR.com and it's $20 for the right gear, unless you need to pop the tailhousing off. I went from 2.73 to 4.1 and was able to use a ghetto gear with too many teeth (not made by ford,) for about 8 years before the teeth started chipping off.

It's an electronic speedo. You either need a tuner or something like the Dallas Mustang Speedcal.

https://www.dallasmustang.com/speed-cal-1994-2004-5-speed-cars.html

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A dealer can't help since it wasn't a factory option. Honestly I would have done a tune first before a gear change.

The speedcal is a good option if you want to preserve the stock tune. With these cars not being drive by wire and no vct, a tune isn't as noticeable as it is on the newer cars. I would certainly do gears and other bolt-ons before a tune. Heck, even longtubes can make a good amount more power with the stock tune with these cars.

01yellerCobra said:

It's an electronic speedo. You either need a tuner or something like the Dallas Mustang Speedcal.

https://www.dallasmustang.com/speed-cal-1994-2004-5-speed-cars.html

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Click to expand...

So, another forum member has and SCT 2 for sale. With one of these I can just go into computer and change ratio or do I need a tune of some sort?

I'm pretty sure I could with my xcal 2 but that was a long time ago.

eicht said:

So, another forum member has and SCT 2 for sale. With one of these I can just go into computer and change ratio or do I need a tune of some sort?

Click to expand...

You'd need a tune with the gear ratio changed.

The Xcal2 isn't supported by SCT anymore. I had issues with mine and now it's it's just a pass through for datalogging. I'd go with an X3 at least if you get a tuner.

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This

http://www.ebay.com/itm/Hypertech-Power-Programmer-3-For-1999-UP-Ford-Mustang-Mustang-Cobra-with-4-6-/252906962829?hash=item3ae26dff8d:g:izsAAOSwHptY-37a&vxp=mtr