It is a common misconception that re-gearing a vehicle is only for hardcore off-roaders or for huge oversized tires. Most of the late model vehicles we produce aftermarket ratio’s for are daily driven vehicles with slightly oversized tires. In an effort to improve fuel economy, late model overdrive transmissions are geared very high which means RPM’s are very low on the highway. When even a slightly taller tire is installed the RPM’s are reduced below acceptable levels that the engine was designed to run. This causes constant shifting out of overdrive, sluggish acceleration, poor economy and rapid wear on the transmission and other components.
By changing the ring & pinions in your vehicles differentials, you can match the ratio to the tire size to bring the RPM’s back to where the manufacturer intended. Typically it is recommended to select a ratio slightly lower (higher numerically) than what the math will tell you. This will help accommodate increased rolling resistance, wind drag, and added weight of aftermarket accessories and gear.
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