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There are optional C-hubs for the tf2 and tf3 that come in different caster angles. Flipping the frontplate upside down and file the holes out a bit will raise the caster on the arm too.

Using the maxxum or lazer front arms will give you more choice in different caster C-hubs again. Trial and error though.

well the 2014 scorpion has 4 spider gears, just like the original scorpion buggy,

http://www.kyosho.com/jpn/support/instructionmanual/buggy/pdf/30613_Scorpion_2014_spop.pdf

part SC228, it shows 4 spider gears, but yeah you want to go get the ball diff, better choice, smoother performance and lightweight.