HorizonHobby.com How-To: Rebuild the ECX® Revenge Type e™ and Revenge Type N™ Differentials

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Regular maintenance is an important part of keeping a high-level of performance on any RC car or truck. Both the ECX® Revenge Type e™ buggy and ECX Revenge Type N™ buggy feature proven drivetrains with conventional fluid-fillable differentials. As you run your buggy the grease that comes from the factory can break down, which can and will alter the handling of your car. It is fairly easy to remove your differentials, service them and reinstall them back on the chassis, and we're going to show you how to do that in this quick tutorial.
When you go to service your differentials, you have a few options available to you. The first option would be to re-pack your differential with some sort of grease. Different greases will have different levels of resistance, which will change the action of the differential. Greases are quick and easy to use; however the more you run them the more it breaks down on a molecular level, requiring another rebuild down the road. The better option would be to use some sort of silicone differential oil. Silicone diff oils don't break down like petroleum-based greases. Also, where grease will thin out as temperatures rise or congeal in colder temperatures, silicone oil remains unaffected by temperature changes. In most instances you will be successful if you use 7000-weight oil in the front differential, 5000 in the center and 2000-to-3000 in the rear. But what does this mean to you?
How a differential works is that it attempts to balance out power delivery to two different sides of a vehicle. As a car or truck rotates around a corner, the wheels on the left and right side of a car do not travel the same distance—the tire on the outside of the car has to travel a greater distance than the tire on the inside. A differential allows the two tires to rotate at the appropriate speeds to get the car around the corner. Now, using thicker or thinner oil in a differential will change the resistance of the differential. Using thinner front differential oil increases off-power steering, but if the oil is too thin the steering will become grabby and inconsistent. Thicker front differential oil increases off-power stability
and on-power steering. In the rear of a car, using thinner rear differential oil will result in a car that has more corning traction and increases steering in the middle of the turn where, thicker rear differential oil has less steering in the middle of the turn and more forward traction.
Now the purpose and operation of the center differential is a bit, well, different. Instead of changing the traction levels of a chassis side-to-side, the center diff changes the power transfer of the motor or engine front to rear. The center differential will help change the attitude of the car as it enters and exits a corner. Using thinner rear differential oil will provide more corning traction and increases steering in the middle of the turn. Using thicker rear differential oil will yield less steering in the middle of the turn and more forward traction. In the end, whether you're working with the front, middle or rear differential, it is a balancing act that you'll need to experiment with to see what fits your needs the best.

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