How often you should change front and rear differential fluid depends on your vehicle, driving conditions and differential fluid quality. That’s a vague answer, but it’s true. If you drive your truck primarily on the highway in temperate conditions and rarely tow or haul, you likely don’t need to change front or rear differential fluid
The need for power and speed is an age-old desire dating back to the chariot races of ancient Rome. It’s since inspired all manner of racing and events. Competitors today can drive everything from modified lawnmowers to top-fuel dragsters capable of more than 11,000 horsepower.
Walk the aisles of most auto parts stores and you’ll find multiple “mechanic-in-a-bottle”-type additives that claim to restore transmission performance. The claims made typically include some variation of the following: