another tip( ), make sure to threadlock all metal-to-metal components on the truck. i read a review on the mammoth st in a magazine, and they said that the engine mount screws, the axle set screws, and the axle cup set screws had not been threadlocked. the magazine mentioned that the truck nearly shook itself apart because the factory skimped on threadlock, so they gave the truck a 7 for parts quality/finish. you dont want to be looking for an axle pin with a broken ankle(even with your wife watching! )