when it comes to diff oil, I think most things are actually CST rated.
its just a lot of us refer that refer to shock oil as 'wt' also then just say the diff oil as 'wt' too.
RTR from the factory is 3000cst oil, but this is with 2-gears inside the gear diff so it will feel comparatively 'thinner'
Overall, there is no substitute for trying it for yourself and going with what you like on your own track.
at Worksop I ran a ball diff, at Maritime I ran a a very thin gear diff because it made the car do what I wanted it to do on that track.
The diff of a 2WD car is a HUGE thing and the optimum setup for this part will not be the same for 2 different drivers.
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Chris Doughty
Team Durango
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