put the rears on ice and the fronts on dry ground. Try to spin the tires. If it's working right you might get a slight bit of spin then just drive away. Or, jack up the rears and do the same thing. Just make sure the jacks won't damage anything when you pull off of them.
With my Razor, it never seems like the front is pulling, except that it just keeps going through mud and over large rocks. I can be spinning through mud or snow and when either front hits dry ground, away it goes. I can drive straight into a large rock like it's a wheel chock and the fronts will just climb over it.
