ORIGINAL: mbeatle
Better batteries than a matched IB4200 pack? I know there's lipo, but you shouldn't need that to eliminate cogging. I think it may just be a loose wire between the ESC and motor.
At any rate, when the truck was running properly, it wasn't cogging. What is the anti-squat setting? Big spacers in rear?
Anti squat is the angle of the rear arms, specifically, the angle where the hinge pin crosses the main mounting on the chassis. Basically, the front of the hinge pin should be a little higher then the rear as it goes through the hinge, kind of like a subtle version of how the front of of the front arms are angled upward. This angular setting of the rear arms prevents the rear end from lowering a certain amount. BTW, the Rustler/Stampede tranny as built-in anti-squat setting where the arms mount to, if you look carefully.