I still dont get them I know that its like Shock oil, the higher the weight the harder it is, and the lower the weight the softer. But What i dont get is why would you change the Transmission oils for lighter ones or softer ones.

Thanks

Excellent questions.
I am just learning about it too.
Hopefully someone with a lot of experience will explain it in laymans terms.
Not only what it does.. but why and what are the benefits one way or another.

Yeah, thats what i was thinking. Cause ive been building a losi 8ight and i wanted to know why they put three different weights for front rear and center. Hmm, hope someone will post.

basicly if you have a lighter oil/ lower #, more power will transfer to the front wheels when you accelerate. the heavier it gets the more the power will transfer towards the rear under power. if your front tires balloon up when you nail it you need thicker oil to transfer more power to the rear. if the car gets squirly when you accelerate you most likely are transfering too much to the rear and need lighter oil.

also for us electric guys braking off the spur gear, heavier oil makes it transfer more braking to the front which is not always good.

K00l thank you very much now i understand. And also the weights i read somewhere, where it said its like shock fluid, like 7000 wt is like 70 or you can call it 70, or w/e like 10,000 wt is 100 and all that idk but yeah, i read that somewhere

no that is not true. diff oil is much thicker than shock oil. dont confuse 50k diff oil with 50w shock oil. i dont know what brand you might go with but in a 1/8 buggy a very common setup is 5000 f 7000 c and 2000 r. i use mugen oils and whatever brand you choose stick with that brand because one brands 5000 might be as thick another brands 6000 ect.

Thank you Gary.

Yes, thank you that actually really helps.

To extend on kvrc's comments. Remember that oil doesn't only change front-to-rear power ratios, but your front and rear diffs use oil as well, so the same concepts hold true left-to-right. Too light in oil front/rear and you won't be able to accelerate from corners. Too heavy and the car will push both going in and coming out.

So its basically a sway bar, and power managment in liquid form.

Hm, no. A sway bar applies forces directly to the chassis. You normally use sway bars on 1/8 buggies, but they perform different functions than differential oil weights. Differentials don't offer power management, they offer power distribution. Sway bars help keep a chassis flat through bumps and cornering, while the oil helps to distribute power to the 4 wheels. There is SOME power management done via the clutch shoes/bell. The best power management is that trusty little trigger finger you have on the radio. :)

In electric trucks and buggies, the transmission, via the slipper clutch, acts as a power management device. It's a crude form of it, but that's what it does. It's not actually true power management because the power from the motor isn't reduced, it is simply spent (by slipping the clutch).

4 wheels = 4 points for power to escape from. You adjust oil weights to apply as much power to the ground as possible. Spinning wheels only equals lost power. There is no magical setup, especially on 1/8 off-road. It takes a lot of testing and practicing to be consistently fast. Hope that helps...It is important not to confuse differentials with other components of the car, they have very little relation to sway bars.

The way you said how it also affected the power from left to right made it sound like ya know, okay. Thanks for all yo guys help