Baxman86

I have a 1994 Mustang GT with a 5-speed transmission and I installed 3.73 gears about a year ago. I have had enough of guessing my speed and racking up imaginary miles so I bought the driven gear recommended to me by Summit Racing but it doesn't set my speedo completely right. It is now 10% off and reads 1.1 miles for every 1. I'm not sure how many teeth my new gear has but the stock one has 19 teeth. My car came stock with 3.27 gears. The Ford dealership by my house doesn't have the charts anymore so they can only guess and I was wondering if anybody knows which gear I should get. If you know how many teeth I need or a part # it would be greatly appreciated. Thank You, Carl Baxter

95stang

I believe you'll need a 23 tooth speedo gear. I went w/ SpeedCal, I like it and can change it for whatever rear gears and wheel/tire combo you have. All it takes is to flip some dip switches in the control box. It's all in how much you want to spend.

95stang

Can't say for sure but I've heard that the 23 tooth gets ate up after a period of time. Maybe some of the others could say for sure.

white93 GT

ive got to get that changed too.......i had the stock 3.08's and then put in 3.73's.......how much off will the speedo be?? and how much will the miles change??? thanks

MelloYello

23 tooth are for 3:73, 4:10 gears...... Your new gear should be a 23, and it will be off just a bit...

I just ordered my Steeda 23 gear, I put it in next week so when the car is on the street Ill let you know how much mine is off

Crazyfast50stang

How do you know how much you are off by? Do you go by RPM's or what?

Baxman86

All you have to do is get on the freeway or any road with mile markers and drive a mile and see how much your odometer is off. Mine read 1.1 miles after a mile so that is an extra 10% so my speedometer is 10% fast.

WesDe

23 tooth gear from ford should do the trick.

hookahooka

http://home.neo.rr.com/chambersracing/speedo.htm

Interesting article from Chris. At the bottom of his page, some important info on what size gears will and will not fit certain applications.
http://www.corral.net/tech/drivetrain/gears.html

Obsol3te

Bleh
how can you fix the speedo for tires?
mines still way off but ive changed from the 15" to 17"