Truth is, if you are not racing, I'd only replace what brakes. Thinking back to my build, I replaced the steering spring and plastic with 1.0 items. I also replace a slew of the short screws with longer ones. From there I did the rear hubs with KHZ models to get the bigger bearings. That's all I did to start. Since then I've done all the bearings, fluids, I put the losi Aluminum front knuckles on (broke the stock plastic 3 times...) and over the winter I added a bunch of hop-ups like the lightened outdrives and aluminum diff inserts. Just drove it for the first time on Sunday, felt quite good. Whatever you do, enjoy it, it's a great truck.