Calibrating a speedometer after putting bigger tires on it?

[Armstrong]

I put a 8" lift on my 2002 F350 diesel and the tires that I put on it are 38x15.5x20. By putting these tires on it, it ended up throwing out my speedometer. At 60mph the speedometer was reading 52mph so I bought a TS performance Respeed to fix the problem but now the needle on the speedometer bounces. I was told that my speed sensor may be bad on the right front wheel but I have had no problems with the bouncing of the speedometer till the Respeed was installed. I have tried Edge's Evolution and CTS. An Edge tech told me that both the CTS and the Evolution were not compatible with my truck. This is my second TS Performance Respeed. I sent the first Respeed back to TS thinking it was bad. Any ideas would help.
Thanks!

[Hank]

Originally Posted by Armstrong

I put a 8" lift on my 2002 F350 diesel and the tires that I put on it are 38x15.5x20. By putting these tires on it, it ended up throwing out my speedometer. At 60mph the speedometer was reading 52mph so I bought a TS performance Respeed to fix the problem but now the needle on the speedometer bounces. I was told that my speed sensor may be bad on the right front wheel but I have had no problems with the bouncing of the speedometer till the Respeed was installed. I have tried Edge's Evolution and CTS. An Edge tech told me that both the CTS and the Evolution were not compatible with my truck. This is my second TS Performance Respeed. I sent the first Respeed back to TS thinking it was bad. Any ideas would help.
Thanks!

My AutoEnginuity scanner will calibrate 'em.

[powerhoghp]

Does the needle still bounce without the module?

[Armstrong]

Originally Posted by powerhoghp

Does the needle still bounce without the module?

Not at all.

[Hank]

PM sent...............

[dockterp]

how do you get to that part with the AE scanner. I bought the ford bundle and can't seem to find my way to that part of it? Thanks

[Hank]

Originally Posted by dockterp

how do you get to that part with the AE scanner. I bought the ford bundle and can't seem to find my way to that part of it? Thanks

When you first start it up and pick your year, pick "ABS Brakes" or something like that. (It has been over a year since I did it and I have forgotten the exact name.) Then over to the right where you find the tests you'll find a tire calibration tool. Good luck. Sorry I can't be any more specific but it has been a while since I did this.

[Davey~do]

Originally Posted by Hank

When you first start it up and pick your year, pick "ABS Brakes" or something like that. (It has been over a year since I did it and I have forgotten the exact name.) Then over to the right where you find the tests you'll find a tire calibration tool. Good luck. Sorry I can't be any more specific but it has been a while since I did this.

Diagnostics; ABS; Boom, there it is. Adjustable in 1/2" dia. increments.

[FlamedoutF250]

I have had the superlifts truspeed hooked up on my truck since fall of 2002 and it works just fine, you can set it for 2 differant tire sizes. i set mine using a gps and it dead on. There was a guy over on fordtruckworld who developed his own , it` was alot like the truspeed unit.

[dockterp]

Found it! Thanks guys! My scantool was actually giving me a hard time so I had to call AE, they got it straightened out and got me upgraded to 9.1. Does anyone know what that means for a weekender like me. This scanner is probably more than I'll ever need as it is, but I was wondering if the new software does anything new or different. I forgot to ask the guy when I was on the phone.