4.6ford

ok recently i put in 3:73 gears in on my 02 mustang gt and i was wondering how much my speedometer was bc of the increase in gear change? i was also wondering some ways to fix that problem i know that i can get something like the diablo tunner but right now i dont have the money for one or want to start puttin 93 octane gas in my car bc of price of gas so what are some of my options.

langod

Dallas Mustang Speed cal will fix the speedo error for $99.

Until you do that you can fihure out how much it's off here: http://www.hardcore50.com/members/calculators.htm.
Your speedo is probably reading about 12% high btw.

blueangelfightr

http://www.partshopper.com/shop/Dall...-Cal-m174.html

Theres a speed cal. If you can't get a programmer get that.

maddash

Get that speedo fixed soon because it throws off the odometer. You are going to be showing higher mileage than what you actually drive.Someone correct me if Im wrong.

Dave2000GT

Although you may not want it now I'd highly recommend getting one of the tuners. They are about 300-350, and you DO NOT have to run higher octance gas, unless you program an aggressive tune into it (advance timing, lean fuel etc...), it will allow you to do many things, and will open up the door for future mod tunes. The speedcal from what I understand is a bit of a pain to install, while the tuner is dead simple to use.

The Great Cornholio

You are correct. Both the speedometer and odometer while running uncorrected are reading about 14% high.

4.6ford, is your transmission automatic or standard? A SpeedCal will presumably not work for automatics past the '98 models.

4.6ford

its a manual transmission thanks 4 the input

Dan04COBRA

https://mustangforums.com/m_600073/tm.htm

The Great Cornholio

A SpeedCal will work then

buster

There is an easier way.....I have 3.73 also.......HYPERTECH!!!!!