i have solid steel axles. brand new too so they have no stress put through them yet. the car itself is extreemly solid. the only problem is my front diff which i said earlier. its graphite gears. thrust balls might not be extreemly clean but i layered them in grease that came with the kit. and all my other stuff is clean. im not going to have a chance to hit anything other then a small rock because im nto going to the track for a while. i also run a hollow graphite drive shaft, which i really dont want to break because its the nicest one i can get for this car. basically everything on the drivetrain is graphite except for my CVDs. they are all hardend solid ones.