This may also be a servo, and servo saver related problem. This truck has alot of power, you may need to tighten up the servo saver. Careful not to go too tight. You can kill a servo FAST! Now, if your trucks diffs are untouched, then they likely have grease in them. You may be pulling bad to one side on power due to the unloading of the diffs. You would know this by one tire ballooning up more than the opposing side under full power. And it may be a combination of the above. In my experience, the JR servo i ran with 188oz of torque kept the truck under ALOT better control, than the stock servo. I'd say to start with the diffs. You could easily do 10k front and rear, with 30k in the center. You could also do 30k all the way around. Depending what you're using the truck for. The heavier you go in the center, the less steering you'll have. As it will become more like a LOCKED diff. Hope that helps some.