1st time building from scratch, need diff help

[REagentmaxx]

I am building my 1st E-Maxx from scratch, all custom, G2 carbon fiber chassis, brushless. I think I have one of my diffs upside down? backwards in the case? (just put them in aluminum cases) When I'm standing at the back of the truck and spin the spur clockwise the rear wheels spin forward and the fronts go backwards (good for burnouts but wont be fast!) looking at the back of truck which way is the spur supposed to spin? and what do I do about the diffs.:032: