Gears/mileage question

jermy82

Founding Member

Feb 2, 2002

446

0

0

Sherman, Illinois

Mar 19, 2004

#1

• Mar 19, 2004

• #1

Got 3.73's in the car yesterday. Feels great of course. But my question is about the speedometer. I know you can buy some different gear to make it read right, but that's extra $ and it doesn't really bother me enough to get it if I don't need it. My question is that does the increased speed that is reading on my speedometer result in more miles being put on the car? I'm not sure if the odometer is dependent on the speedometer or not. I'm sure this is a pretty simple question, but had to ask. Thanks.

 

Joes95GT

New Member

Jan 23, 2003

3,132

1

0

Delaware

Mar 19, 2004

#2

• Mar 19, 2004

• #2

Yes, the odometer and speedometer are directly related. You are putting more miles on the car than what there actually is.

Joe

 

mytight95

Active Member

Apr 11, 2003

2,605

0

46

Dothan,Al

Mar 19, 2004

#3

• Mar 19, 2004

• #3

yes when i had my 4.10's installed, i waited about three months to fix my speedo, and i racked up about 1500 miles with only around 750 driven, the higher speed you drive the more it is off.


jason

 

jermy82

Founding Member

Feb 2, 2002

446

0

0

Sherman, Illinois

Mar 19, 2004

#4

• Mar 19, 2004

• #4

Thanks for the info. Do you know how much the different gear is to make the speedometer read right is? Do I have to go to Ford directly to get it? Thanks again.

 

B

blackEagle

Founding Member

Dec 12, 2001

116

0

16

Calumet City,IL

Mar 19, 2004

#5

• Mar 19, 2004

• #5

jermy82 said:

Thanks for the info. Do you know how much the different gear is to make the speedometer read right is? Do I have to go to Ford directly to get it? Thanks again.

Click to expand...

You need a 23 tooth gear to fix the speedo. Ford does not make one however, you can get it from the aftermarket(steeda, Holcomb, ect.).

The highest FMS gear is a 21 tooth.

 

Joes95GT

New Member

Jan 23, 2003

3,132

1

0

Delaware

Mar 19, 2004

#6

• Mar 19, 2004

• #6

To get the speedometer to read right, you can do two things. The first and probably the easiest would be the Dallas Mustang Speedcal. It's a computer type thing that you wire up into the electronics of the car and it compensates for tire size as well as gear ratios. You could also change drive and driven gears. You cannot use the 23 tooth gear and expect it to be right - it will still be off. What you need is a 20 tooth speedometer gear, and a 6 tooth drive gear. The drive gear is in the tailshaft of the transmission.

Joe

 

randomjoker

New Member

Sep 12, 2003

427

0

0

Oklahoma

Mar 19, 2004

#7

• Mar 19, 2004

• #7

Yeah the drive gears cost some where around $2..

 

jermy82

Founding Member

Feb 2, 2002

446

0

0

Sherman, Illinois

Mar 20, 2004

#8

• Mar 20, 2004

• #8

Thanks again for the help. Anybody got a link?