Below is a chart I made up to help people decide what gearing they want to change to depending on tire size.
This is specifically for gas engine Ford Super Duties and Excursions with 4R100 transmissions and 10.5/10.25 Ford rear Axles. A nicer and more readable copy of the JPG is available in my gallery under the miscellaneous album.

Enjoy

 

Reps for you! Scratch that it wont let me. must spread the love first.

 

Thanks. glad you like it. I realized that at least half of all the regearing threads could be answered easily by a chart like the one above and make all our lives easier.

 

Will add this to the tech folder later today.

Good job (as always), Bion!

Stewart

 

Shows what I've been seeing with my 315's and the 4.30 gears vs the OEM tire size. That 200 rpm drop at highway speeds has had a noticeable mpg effect. Almost a 1 mpg gain. City only lost about 0.5 mpg


Great work!