458540P / 458540P - Application Notes STILLEN FRONTIER DIFFERENTIAL COVER Keep your differential cool with a Stillen Frontier differential cover. This differential cover was designed specifically for the Nissan Frontier to fit perfectly in place of the factory cover.* Installation of the differential cover will result in increase fluid capacity by 7/8 quart. That's 41% over stock! The added capacity helps to improve cooling and the life of your differential.** *Only fits 2WD models. **Differential wear may vary depending on driving habits and conditions.