Speedometer adjustment
Thread Starter
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Posting Guru
Joined: Apr 2004
Posts: 1,399
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From: Corinth, TX
Speedometer adjustment
hey guys,
I just put 33" tires on my '93, and I want to correct the speedo. Is it worth the $180 (4wheelparts.com) for a TruSpeed, or is there a more affordable alternative? Any suggestions welcome.
Thanks!
Josh
I just put 33" tires on my '93, and I want to correct the speedo. Is it worth the $180 (4wheelparts.com) for a TruSpeed, or is there a more affordable alternative? Any suggestions welcome.
Thanks!
Josh
Elder User
Joined: Nov 2003
Posts: 669
Likes: 0
From: Chino Valley
get ready to do a little math, http://www.broncodata.com/tech/psomform.htm
this site gives you the formula for the constant you will need to recalibrate your speedo. (constant is a number that represents the computer's calibration for a certain tire size.)
https://www.ford-trucks.com/articles...peedorecal.php
here is the article about resetting your speedo, its kind of hard to understand, so if you need further help, just ask me
this site gives you the formula for the constant you will need to recalibrate your speedo. (constant is a number that represents the computer's calibration for a certain tire size.)
https://www.ford-trucks.com/articles...peedorecal.php
here is the article about resetting your speedo, its kind of hard to understand, so if you need further help, just ask me
Thread Starter
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Posting Guru
Joined: Apr 2004
Posts: 1,399
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From: Corinth, TX
haha... after going through all the math... the second link contains an example tire... which just so happens to be the exact tire i bought!! 
. so, i guess i know that my math is right. As soon as I get home to my toolchest (for the wire and clip) I'll get this sucker reprogrammed. BTW, the tires look awesome. Especially since i was running non-agressive street radial 31.10.5 (on it when i bought it). Only problem is, i just spent $700 on tires, now i want to lift it!
-Josh
. so, i guess i know that my math is right. As soon as I get home to my toolchest (for the wire and clip) I'll get this sucker reprogrammed. BTW, the tires look awesome. Especially since i was running non-agressive street radial 31.10.5 (on it when i bought it). Only problem is, i just spent $700 on tires, now i want to lift it!-Josh
Senior User
Joined: Aug 2003
Posts: 117
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From: Medford, OR
Originally Posted by djjoshuad
haha... after going through all the math... the second link contains an example tire... which just so happens to be the exact tire i bought!! . so, i guess i know that my math is right. As soon as I get home to my toolchest (for the wire and clip) I'll get this sucker reprogrammed. BTW, the tires look awesome. Especially since i was running non-agressive street radial 31.10.5 (on it when i bought it). Only problem is, i just spent $700 on tires, now i want to lift it!
-Josh
. so, i guess i know that my math is right. As soon as I get home to my toolchest (for the wire and clip) I'll get this sucker reprogrammed. BTW, the tires look awesome. Especially since i was running non-agressive street radial 31.10.5 (on it when i bought it). Only problem is, i just spent $700 on tires, now i want to lift it!-Josh
