a couple of " anyway to fix this problem " questions

[blueb8llz]

first problem is: my right tire/wheel on the front side and my left wheel/tire on the rear side wiggles.
if you grab the tire and wiggle it, it moves more than the others. its that type of wiggle where when you dont tighten the pillow balls tight enough, and you know how the tire will wiggle? but i can tighten them all the way and it will still wiggle? it moves where the yolk from the driveshaft and the axle carrier is. does the mean i need a new axle carrier?

my second problem is: one of my tires spin in a wierd. its not unbalanced because it doesnt spin lopsided or anything but picture this....i mark the center tire with red paint...( just like them new vantage tires ) instead of the red line spinning straight, it would spin in a squiggly line. all my other tires spin perfect.

sorry for the long post, just trying to be as descriptive as i can. please all help will be much apprecieated. if i was to have any petpeeves on rc vehicles...i only have two, and im having both of them right now..haha