build a gmaxx and i need help

[suicideneil]

When putting oil in the diffs, the best way I found is to put the spider gears in, then put the oil in until its almost overflowing, then put the ringgear/cap back on which also holds the remaining spider gear- tighten the screws in a diagonal pattern (1,4,2,3, as though they are numbered left to right, top to bottom). Assuming you didnt miss out any gears or gaskets, and you didnt also fill the diff housing itself with oil, then when you try turn the wheels in opposite directions (on the front end, not connected to the tranny), you should feel more resistance vs the rear end. There shouldnt be any/ very much backlash between the diff and pinion gear either when you rotate the pinion shaft by hand.