the engine runs just fine (OS made) the truck just can't hold together around it the chassis flexes so much that the spurgears come out of contact withe the clutch bell, the spur gear hits the rear a-arm when its compressed and, the drive line is the worst system i have ever seen on an rc car/truck.
BTW i ahve a t-maxx and my friend got the MAX ST pro and he got sick of trying to figure out whats wrong with it every second (its his frist rc) ( the cheap price led him into getting a cheap truck) so he left it at my house to let me have a try at it the only quality on it is the steering system and the engine.
it seems like duratrax just throws a heap of plastic and some aluminum together and call it an awseome machine, and granted, when i get the magic setup and all the screws locktited to death and tuned to as best as i can get it, the truck really performs pretty well, but it wont stay liek that for more than a tank of fuel.
hes gonna try to return the st pro and get a rush evo which i think is a good idea, but i dont know if he'll be able to return it.
cheers