Gear swap

[fordman2121]

The only thing the new gearing will affect is shifting. You need to change that so it shifts correctly.

The speedo will not change because it uses the same speed sensor gear. Unless you change tire size your speedo does not need calibrated. And even then the tuning will not be that different. You will want a faster shift with the 4.10.

O yeah fogot they now take speed off of the diff. I was thinking earlier superdutys. I stand corrected :fustrate: I hate beening wrong and giving bad advice.