Chris you are right the losi truggy does have a tendency to be loose in the rear. try more toe and anti squat the M2C adjustable rear toe block system works great on it. also try different diff weights like 7-10-5 or 7-10-3. That will help as well I would try the changing the diff fluid first. You will notice a definite improvement the question is will that be enough. If the M2C complete toe system is to expensive for you get the M2C 3/4 rear plate. It's there old model but works great and its only $12. You can also try the lightest sway bar in the rear as well. The fronts are wearing more because the rear is squatting to much raising the front up. anti squat makes the the truggy roll more towards the front giving better hook up to front tires and less wear.