I bought a used rampage Mt and it runs and drives good but feels like it has drag on the drive train cuz it slows it's self down a lot when I let off the gas and the brake is not dragging.. I took off all 4 wheels and noticed the back hubs spin freely by hand on both sides but the front hubs get maybe a 1/4 turn either way and stop on both sides.. I can not turn the front axles at all by hand? Is this a diff issue? And no the pins are not sticking out and dragging.. shouldn't it spin just as freely as the rear? Any help would be greatly appreciated as I am new to 1/5 scales