If you are bashing then the stock diff oil isn't bad, 5,100,5, if you bash on a loose surface you could drop the centre diff down to a thinner oil, maybe 30k or 50k. but the stock oils give it plenty of raw power.
if you do race you'll need to go a lot lower for handling and control, i currently race on astro tracks and use 5,6,2.
I've heard good things about the longer rear shocks, although i've never used them myself, always managed to get a good setup with the stock shocks.
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