Adjusting Speedo and Odometer

[6.0DSLPWR]

I just replaced the factory tires on my truck with 35x12.50x18 tires. I thought my SCT x3 would be able to adjust the speedo for me. But after searching on here I found out that is not the case. Apparently the SCT only adjusts for transmission shifting?

I know lots of guys have larger tires on here and I was wondering what you guys did to adjust your speedo. I would prefer not to take it to ford or any other shop and have it done since I am known for changing tires on my vehicles often and it would probably get expensive going back to the shop every time I change tires.

I am looking to purchase a module that can do this that way I can do it myself. Does anybody with the AE software know if it is capable of doing this? Since I would like to buy the AE software anyway this might be the excuse I need to do so. Thanks

[Strokin6Liters]

I don't know about the AE but i have heard good things about the Truspeed module.

[Davey~do]

Originally Posted by 6.0DSLPWR

I just replaced the factory tires on my truck with 35x12.50x18 tires. I thought my SCT x3 would be able to adjust the speedo for me. But after searching on here I found out that is not the case. Apparently the SCT only adjusts for transmission shifting?

I know lots of guys have larger tires on here and I was wondering what you guys did to adjust your speedo. I would prefer not to take it to ford or any other shop and have it done since I am known for changing tires on my vehicles often and it would probably get expensive going back to the shop every time I change tires.

I am looking to purchase a module that can do this that way I can do it myself. Does anybody with the AE software know if it is capable of doing this? Since I would like to buy the AE software anyway this might be the excuse I need to do so. Thanks

SCT will only affect the shift points, correct.

AE WILL correct your speedo for larger tires. It will allow adjustment up to 40", in 1/2" increments. The AE software rocks, you wont go wrong with that purchase

[RescueF250]

Ive had 38's never adjusted it got used to it, also your gonna have to adjust your revs per mile in your tune. Not sure who your tuner is but you can reload the same tune and adjust your revs per mile then on your own helps with the trans.

[6.0DSLPWR]

Originally Posted by RescueF250

Ive had 38's never adjusted it got used to it, also your gonna have to adjust your revs per mile in your tune. Not sure who your tuner is but you can reload the same tune and adjust your revs per mile then on your own helps with the trans.

Many years ago I had a 88 F150 with larger tires and the speedo was always off because of it and I never worried about it. But if the speedo is off the odometer is going to be off aswell right? I want to adjust the tire size so my odometer will be correct.

Regarding tunes....I have tunes from eric and matt. I am just going to look up the revs per mile for my tires and change it when I upload the tune instead of getting the actual tunes changed.

I think I am going to order AE next payday. Ive wanted to get the AE software for awhile anyway and I think it would be a really good thing to have for diagnosing any issues I will have with my truck and I can use it to change my tire size.

[Banshee365]

I have the Merlin Controls Speed Wizard, works awesome.

[Abrannan19]

Merlin Controls Speed Wizard is top notch, I have 2 of them in stock if you are interested.