For starters I changed the front spring to the ones off of the old Rustler the red ones. I also changed the shock oil and the diff oil in the rear cleaned out the grease in the front and added oil to it. WOW what an improvement all of that was to the handleing. For the shock I went 50 in the front and 40 in the rear, and in the diffs I went 5000 in the rear and 3000 in the front. It handles great now I am very pleased with the ease of maintance on this truck.