Will 35's mess with transmission shift points and engine RPM programming?

[OffRod150]

Im throwing some 35s on my 23 FX4 with a 2" spacer kit. Does anybody know if this is going to screw up my transmission shift points and engine RPM programming? I am going to be towing a Travel Trailer around 1500 miles right after I do it and am trying to find out if it will hurt the truck/transmission if I dont reprogram ECU with proper tire size? I know speedo will be off, but I am more worried about performance and potential damage.

Thanks in advance.

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[MillstoneF150]

Tuner/Programmer would be best but I have heard that disconnecting battery and letting the truck fully die resets the computer so it will re learn shift points.

 

[Tall Tail]

Whats your rear axle ratio?
What engine?
How heavy is your trailer?
There should be some calculators online.

 

[9663mu]

Besides your speedo being off like you mentioned , i don't know of any other issues with regards to Trans/shift points. I went from the stock 18s like you to 295/70/18 and then to 35/12.5/17 and noticed nothing shift point related.

 

[crazywayne311]

only thing i seem to notice is my MPG has dropped like 2MPG haha
I was averaging around 17.2-18.2 with Fuelly but my last fill up with 14.9! but i did add an exhaust and i did add heavy ass tires.

I will say my truck seems to want to rev a little bit more now that ive added the heavier tires before shifting.

 

[OffRod150]

Whats your rear axle ratio?
What engine?
How heavy is your trailer?
There should be some calculators online.

355 gear, 3.5 eco, 6500lb trailer (Fully loaded)

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