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.
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.
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.
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