Hi gary first question is are you going to be using it as a 4wd or a 2wd? If as a 2wd I run 2k in the rear diff core rc 450 oil front and 350 rear with kit 3hole pistons all round everything else set up wise can be changed trackside. Come and see me
As for tires dry yellow spikes rear yellow cut staggers front wet no one knows yet to run on the new astro when soaked
Hth