Hi Adrian

I would try a oneway in front & spool in the rear ( this setup lets you do handbrake turns ) & is easy to drift with or just go with 2 spools / 2 really tight ball diffs .........

What tyres are you using ?

As for gearing start low & when you get the nack of it gear up for more speed & longer drifts , just check motor temps every now & then ( i don't think it will get very hot )

Hope this helps

See ya