I need some help, I have a 95 f150, 2wd with the 8.8 rear with 3.08’s from factory. Got decent gas mileage for something shaped like a brick with the stock 235 tires. I recently lifted it 2.5” and threw on some 32x11.5x15s. Now the truck will not stay in overdrive on the highway. Not sure what rpms I’m running due to not having a tachometer. I’ve recalibrated the PSOM and that helped a little and my speedometer is still 5mph off which isn’t a big concern. What gear ratio do I need to switch to or do some of yall recommend. I don’t tow anything heavy, at most 4000 lbs every so often, this is mainly my daily driver with quite a bit of interstate 70+ mph driving. Any help or guidance would be greatly appreciated!

 

3.55's would put it back close to stock. However, with the lift and wider tires you may want to look at 3.73's.