Spencer, I have done the swap in my 41 1/2 ton to the 3:55 gear from Patrick's and I am more than pleased with how the truck runs now. 235 (63) stock 4 spd trans and 3:55 gear with stock tires. Runs well at freeway speed of 65-70 at 2000rpms. No down shift to climb a fairly good grade abt 6% gas milage has improved and I still have the stump pulling power in first gear and great driveability on the highway. Also went with a front disk brake conversion to help with the stopping. Going fast is great but stopping is a whole lot more important.
