Installing Lift & Larger tires and/or wheels on your vehicle? To be done right, it will require you to re-gear the diff(s) to keep the car or truck from struggling for power. Oliver’s Drive Line & Gear specialists will re-gear the axles to get you back to that stock power feel , get your RPM levels back where you can run O/D on the highway and even improve your fuel economy. For hardcore off-roaders and rock crawlers, Oliver’s can get you to an extremely low ratio, like 4.56, 4.88, 5.13 5.38 and in some cases even lower.