Since we're talking diff fluids, Ijust opened up the diff's on my Backdraft 8e and found the rear had very little grease (red in color)and the front had no visible signs of any lubricant. Is that something to be worried about?

I've run the buggy through a couple charges on the battery so far. Iended up adding some valvoline general purpose grease to the front and rear gears while I was in there.