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Currently on the Truck is a 40 tooth spur and a 15 tooth bell with the stock tires 5.75 x 3.5 12mm hex...I have another set of tires that are 6.75 x 4, what should I change the gears to to get the best speed in grass/dirt ( I do not have the ability to weigh the tires) as you can also see by...

Thanks, I will be breaking down some of the truck the weekend to see what gears are on it now and measure and try to weigh both sets of wheels and post that info for more input

I have both size engines, currently the 2.5 is on it as after sitting in the semi open New England weather for a few years the 3.3 needs some TLC...oops health issues make you forget where you left your fun toys! I will look into what gears I have on it now this weekend. Again thanks for the info.

Pinion gear being the Spur ear right? ( I know I am an idiot for not remembering all of this stuff from years ago)Thanks for the info, I will purchase a few different combinations and see what happens. This size that I got from a friend.

If I increase my tire size, do I need to change any gears in my Revo 5310? Thanks for any and all info.