help on calibrating speed odometer

[silver beast]

just bought a new to me 6.0 it has 37" tires speed odo is about 12mph off what do i need to do ??????

[Rob]

i also have 37'' tires, i am only off about 5 MPH. have you had someone follow you and check the speed??

[todd]

superlift truspeed it lets you recalibrate for tires and gear changes $175

[bigd4x4]

+1 for truspeed. Perfect box for an 06

[Mercury]

where are you guys getting prices shipped for 175?

Theres other boxes out there too...

Kenny

[ebusa]

Superchips Tirepaq (expensive) or a Accupro: Accu Pro Speedometer and Odometer Calibrator

[Mercury]

problem with accupro =

Tire Sizes = 24in. - 34in.

BLEH... i have 37's plus i spent less on the box I use

Speed Wizard, kind of like a tru speeed but less expensive, smaller, and can be calibrated while parked (shows a user interface through the speedometer)

Kenny

[Diesel Freak]

I've got 37's also
Speedo Says 40 I'm doin 37
................. 50............ 45
................. 60............ 55
................. 70............ 63
just had mine calibrated..I'm using my Bully Dod Outlook and it's pretty accurate

[Mercury]

I've got 37's also
Speedo Says 40 I'm doin 37
................. 50............ 45
................. 60............ 55
................. 70............ 63
just had mine calibrated..I'm using my Bully Dod Outlook and it's pretty accurate

That does not look accurate at all to me (sorry just being a little sarcastic)

here is mine:

50 on GPS = 50 on speedo

75 on gps = 75 on speedo

100 on gps = 100 on speedo

And every number in between works fine too... but I did not want to type them all.

I use the Speed Wizard

Kenny

[Albin]

Better yet, spend the $175 on a good GPS and ignore the speedometer. That's what I do and my tires and wheels are stock.

Al