RCU Forums - center diff????

I'll copy and paste :). Because you'll be running a truck instead of a buggy anything you rear next about diff setup your just going to need some thicker oil because of the larger tires and weight. Anything thats going to be put next is from another thread and its a buggy setup. Also to put the oil in the diffs you need to take the diff out and disasemble it and clean it before you fill it with new diff oil. If your only bashing around non of this is nesissary and neither is a center diff.

Front diff- Thick oil: Thick oil will give you slow turn in because of the resistance between the wheels but strong on throttle grip because it will put more power to both wheels instead of power to the single wheel with the least traction (the inside wheel). Thin oil: very responcive steering and quick turn in because theres little resistance between how fast each wheel spins (this can make the car's handling very twitchy aswell) but you wont get much pull when your on the throttle steering out of a corner because it throws all of the power to the wheel with the least traction. Good choice range would be between 3,000 to 10,000 weight. For an MT... 5,000 to 20,000 weight.

Center diff- Thick oil: thicker oil will give you lots of power to all 4 tires under accleration because the diff is getting closer to being locked so you also get a lot more straight ahead pull with all 4 tires putting power to the ground... if your on a high traction track where you can't break the rear tires loose of traction this will give you understeer because the rear tires push the front tires straight ahead.... on low traction tracks this will give you oversteer on throttle because it will break the rear tires loose of traction easily making the rear end slide out. Thin oil: lots of power thrown to the front tires making it more like a front wheel drive buggy so on straight ahead acceleration it wont pull as hard as the thicker oil will... more power to the front wheels = more steering with the wheels turned when your on the throttle no matter what conditions your in but it wont try to break the rear tires loose as easily making the buggy more predictable to drive. Good choice range would be 5,000 to 10,000 weight. For an MT.... 7,000 to 50,000 weight.

Rear diff- Thick oil: slow turn in because of high resistance between each wheels speed but when your on the throttle it will break traction to both rear tires because of the "posi" type traction making the buggy loose on exits (this can make the buggies handling a little unpredictable). Thin oil: quick turn in because of low resistance between each wheel... for exiting corners on throttle it puts a lot of power to the tire with the least amount of traction (always the inside tire) making it hard for both tires to break loose and lose grip of the surface which makes handling very predictable and smooth. Good choice range would be from 1,000 to 5,000 weight. For an MT... 3,000 to 10,000 weight.

Best base setup is to put close to mid way between each of the extreme I put (about 10,000 front - 20,000 center - and 5,000 rear for your mammoth. I never raced a truck so thats all based on educated guesses really. Atleast you have somewhere to start now)

This is a lot of information to take in all at one time but it will really help you get the buggy to handle how you want it to and will be very helpfull if your racing. Good base setup seems to be 5f-7c-3r and thats what I'm running in my kyosho. 5 front smooths out turn in while gived good pull out of the corners... 7 center does give me a tiny bit of push on throttle unless I can break the rear tires loose but it really helps me accelerate hard going straight... 3 rear keep the rear stable letting me turn in easily and still break both tires loose a little when I want to. The best way to learn what diff setups do what is hands on experience but this should really help you out.