After installing 285/75/r16 tires my speedometer and odometer is off. How can I get them back in sync? Is there more than one solution? If so, which way is cheapest and which way is best?

 

I would like to know the answer to your question too! A local dealer told me they cannot change the settings, even though I am going from stock 255/70/16 to stock 265/70/17. I told them the new wheels and tires are still a stock size, but they said they had no way of calibrating the electronics. I think they are full of crap! Has anybody else had their speedometer calibrated to bigger tires? If so, please help me out. How did they do it, and who did it please?

 

It depends on the model-year of your truck as to the procedure for recalibrating the speedo.

If you have a '97-'98, then there is a plastic gear in the transmission that you can change. Takes about 5 minutes.

If you have a '99-'01, then the dealer has to recalibrate the speedo with his Ford computer equipment. You'll need to be able to tell him how many revolutions per mile the new tire makes. Some aftermarket computer chips can also recalibrate the speedo, too.

 

Nomo, et al-
Since I have a '00 with a Superchip, do you if the Superchip automatically recalibrates the speedo?

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2000 Wedgewood Blue Expy XLT 5.4L 4WD, C&C group, towing package, beige leather interior, captain's chairs, 6 CD Changer, 255/70R16, all-weather floor mats, factory fog lamps, Mobil1 5W-30 Synthetic w/ Puralator filter

MODS
Ford Bug Deflector (2/15/00), Superchip (3/11/00), Airaid (3/23/00), Edelbrock IAS shocks (3/23/00), Jardine cat-back exhaust (4/6/00, removed 8/22/00), Under Seat Locking Storage Drawer (6/6/00), MPC Rear Air Foil (7/2/00), Super-White Headlamps and Foglamps (1/15/01)

 

Automatically- NO, it doesn't.

If you ask Mike (Superchips Distributor), he should be able to help you work out the details of sending the chip back for "custom" programming. However, I think it would be easier & cheaper to just take it to a dealer & have them program the factory ECU. If you go to a dealer, be sure to remove the Superchip beforehand.


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1997 4x4 Expedition- 4.6L, true dual exhaust w/Ravin DI/DO, K&N air filter, SuperChip, airbox mods, Edelbrock shocks, 285/75R16 BFG ATs, 2000 F150 "XLT" wheels, 4.10 gears, Auburn LS, Clarion In-dash CD player, Smitty Bilt push bars and nerf bars.

2000 4x4 F250 SD XLT SuperCab SWB- 6.8L, Offroad Pkg, Camper Pkg, 4.30LS, Tape & CD player, Remote Keyless Entry, Sliding back glass, tinted windows, 265/75R16 OWL tires, Smittybilt nerf bars & Line-X bedliner.

NoMo's site

 

Nomo is right. Checked with the dealer, they said it is impossible. Mike from Superchips said they only thing the dealer can do is program my truck to a stock gear ratio. On a '99 4x4 it is either 3.55 or 3.73. Mine has 3.55, and 3.73 is too much. I just bought a flip chip from Mike for $325. It will fix my speedo, do everything else a superchip does, and allow me to choose 87 or 93 octane fuel. Can't wait to get it in!

 

 

Where can I get some information on how to do this so I can get back to normal?