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Yes. Thats right Its going to be different for every rig. When it comes to aftermarket support I try to makes sure anything aluminum is made from 6061-T6 or 7075 aluminum and I try to make sure any kind of gearing is made from hardened steel. the FDR I think is more of a racing spec you would...

oh yeah, you're right, I wasn't referring to the spider gears, thats just for slip. I was referring to ring and pinion in the diffs. Poor choice of grammar in my previous statement.

I could have sworn that the FDR calculators I've seen online have you plug in diff gears also but I could be wrong. I dont mess with those numbers so I might be misremembering

In order to come up with the FDR everything in the entire driveline is taken in to account. pinion, spur, all the gears in the transmission or center diff (minus spider gears), all the gears in the F/R diffs (minus spider gears). Traxxas knows all of that info and they came up with that formula...

Yes, thats correct. or you could look at it as the spur will have 2.5 times more teeth than the pinion. For example if your pinion has 10 teeth then your spur would have 25T. I just used those number for the sake of keeping the math simple but lets say you had a 54T spur and you wanted to run a...

I would just start with something like a 2.5:1 gear ratio and then just tune it from there based on motor & ESC temps.

They make single 6S packs or you can just velcro two 3S packs together. I can't speak to exactly what needs to be done to pull off the conversion though as I've never done it to a REVO. I've done it to a few other kits but not that one.

I think you should fully mod it and run it on 6S