1/10 car sliding??
 

this is re a trinity 1/10 car or maybe size doesnt matter? anyway Ill gun it F/T and the back end wants to slide around, like it wont track striaght, any reason for that? the present tires are treaded and its on asphalt

If it's shaft drive, it's most likely torque steer.
If it's belt, I have no clue.

If it has two diff's in it, then the front diff should be alittle tighter then the rear. Otherwise its just like have a rear wheel drive car.

Also, make sure you have a good rear wing on it. RC Cars require them for stability, and to keep the nose pointing forward.

Shawn.

That can cause for example - dead ballbearing, unequal shocks, little rear toe in, etc.

This is a little simplistic but check your rear toe. You should have 0.5 to maybe 2 degrees of toe in. Without it it can cause the car to feel very loose in the back.

Starting point, Toe-in frt & rear at 1 degree. Then Ball Diffs frt & Rear, Tighten till, by hand, turn rt rr wheel forward direction, left rear turns the same forward direction. Same thing on your frt diff. Then adjust each frt and rear diff till your satisfied.

Which ever side it's sliding more torque is supplied on that side. Tightening the diffs should put equal torque on you rear wheels.

Good Luck!!