Speedo Correction for SuperDuty

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

SuperDuty - 18 Jun 2005 02:27 GMT

Can anyone tell me if the speedo in my 2002 F-250 Superduty can be
re-calibrated for 35" tires. When I had my 33" tires the speedo was correct
as I verified with my GPS system. I would rather not splice into any wiring
if at all possible. Thank you for your information.

Superduty

Reply to this Message

Tyrone - 18 Jun 2005 02:46 GMT

> Can anyone tell me if the speedo in my 2002 F-250 Superduty can be
> re-calibrated for 35" tires. When I had my 33" tires the speedo was correct
> as I verified with my GPS system. I would rather not splice into any wiring
> if at all possible. Thank you for your information.
>
> Superduty

Take it to the dealer. It can be reprogrammed. But, it can only be
reprogrammed a couple of times, then you are stuck.

Reply to this Message

ross - 18 Jun 2005 02:55 GMT

>Can anyone tell me if the speedo in my 2002 F-250 Superduty can be
>re-calibrated for 35" tires. When I had my 33" tires the speedo was correct
>as I verified with my GPS system. I would rather not splice into any wiring
>if at all possible. Thank you for your information.
>
>Superduty

Look over at drivetrain.com. I saw an aftermarket speedo adjuster over there.
Didn't really check it out - not sure if it would meet your needs or not.

Reply to this Message

The OTHER Kevin in San Diego - 19 Jun 2005 03:37 GMT

>Can anyone tell me if the speedo in my 2002 F-250 Superduty can be
>re-calibrated for 35" tires. When I had my 33" tires the speedo was correct
>as I verified with my GPS system. I would rather not splice into any wiring
>if at all possible. Thank you for your information.

I was told by two local dealers they couldn't calibrate the speedo
with tires that large. they both told be about 33" was the largest
they could do when I put 35's on my '02.

I bought a Superlift TruSpeed reclibrator and it took maybe an hour to
install/adjust. 1 tap off the ABS signal wire and a tap to +12v out
of the fuse panel was all it took.

I bought one of those SuperChips ECM performance programmers and found
it had tweaks for adjusting tire diameter and gear ratios to correct
the speedo.. It was about $370 a couple years ago. Simple plug 'n
play.. Just gotta pull the fuel pump fuse while you're programming.

Reply to this Message