Speedometer calibration after lift/tires

[16plati]

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Really? That's not much different than the Bilstein 5100 replacement I did on my Tundra. I used the top ring land on the 5100's instead of the ReadyLIFT on my Tundra and that worked out great.

Yeah, I know it's a Ford Forum, but I've done all my own work before and I really liked this truck and kept it for 12 years before buying the Expy.

When I need new tires I’m going with the F-150 5100s up front and expeditions in the rear. F150s give the same amount of lift at setting 2 as the Readylift spacer

 

[Fitz]

I have taken my 2018 FX4 Expedition Max to the Ford dealership and they say that there isn’t even an option to recalibrate speedometer to fit my tires using the Ford FDRS. I am off around 5mph when it says I’m driving 70mph it is around 75mph. I have the ReadyLift 3/2 spacers with Goodyear Duratrac’s LT285/75R18 tires. Will be watching this Thread to see if anyone figures out the fix for this....

 

[Paddler]

It looks like that rear tire should be back a couple inches,really odd looking.

I agree. Total waste of money and very ill-advised. Looks dumb.

 

[Rancidlunchmeat]

I have taken my 2018 FX4 Expedition Max to the Ford dealership and they say that there isn’t even an option to recalibrate speedometer to fit my tires using the Ford FDRS. I am off around 5mph when it says I’m driving 70mph it is around 75mph. I have the ReadyLift 3/2 spacers with Goodyear Duratrac’s LT285/75R18 tires. Will be watching this Thread to see if anyone figures out the fix for this....

Looks great! What wheels are those?

 

[lurch]

Why does a lift on IRS pull the rear wheels forward?

 

[16plati]

Why does a lift on IRS pull the rear wheels forward?

Bc you put that huge spacer on top changing the original angle of that suspension

 

[16plati]

I have taken my 2018 FX4 Expedition Max to the Ford dealership and they say that there isn’t even an option to recalibrate speedometer to fit my tires using the Ford FDRS. I am off around 5mph when it says I’m driving 70mph it is around 75mph. I have the ReadyLift 3/2 spacers with Goodyear Duratrac’s LT285/75R18 tires. Will be watching this Thread to see if anyone figures out the fix for this....

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Your gas mileage is gonna be off to if you don’t recalibrate, and your stock gearing and shifting strategy is no longer optimal for increased tire size

 

[Paddler]

I think it odd that people would jack their vehicle to decenter the wheels and tires, then have to cut the wheel well liners, recalibrate their speedo, etc, the benefit of which is increasing ground clearance by one half of the increase in tire diameter. I will repeat, really dumb.

 

[lurch]

I think it odd that people would jack their vehicle to decenter the wheels and tires, then have to cut the wheel well liners, recalibrate their speedo, etc, the benefit of which is increasing ground clearance by one half of the increase in tire diameter. I will repeat, really dumb.

That is true of your suspension and steering components. But when driving off road you should be putting the biggest objects under your tire where they are not comminginto contact with those components. The approach, breakover and departure angle will all improve and you will have more room under your running boards where those big objects should be passing.

That being said, having Jeeped for many years around Colorado and seeing what the trails here do to well out fitted wranglers. I would not be offroading my Expedition. The lower arms are stamped metal and would not survive many hits.

 

[Paddler]

That is true of your suspension and steering components. But when driving off road you should be putting the biggest objects under your tire where they are not comminginto contact with those components. The approach, breakover and departure angle will all improve and you will have more room under your running boards where those big objects should be passing.

That being said, having Jeeped for many years around Colorado and seeing what the trails here do to well out fitted wranglers. I would not be offroading my Expedition. The lower arms are stamped metal and would not survive many hits.

Exactly. Especially true of the Max version, which is what I have. Trying to make an off road vehicle out of it is an exercise in futility.