This is a knex truck I made last summer and I have been adding on to it ever since to make it better. This truck is a 4x6 with front suspension. The gearing in the back is 2 blue gears and 2 red(or yellow) gears, and it is geared down slow. If you think this truck is familiar then you are correct. I got some of the ideas from:https://www.instructables.com/id/Semi-Truck-and-Trailer/ so some credit goes to them. I apologize for not doing an Instructables but, I PROMISE when I do another truck i will show all you how I made it.