First take a one by 4 or one by 5,6,7,8,( what ever turns you on) Just sure it is long enough.The one by 8 ( that is the one i used)must have technic holes.Place a pin in the second hole of the technic block.take another one by 8 and stick them together.Place a flat two by 4 on the top and one on the bottom.Put a one by two technic each side of the two by 4's.Place a gray pin on the one by 2's.Take a pair of wheels and tires.Attach the wheels to the tires then put them on the gray pins...DONE! here is what it should look like by Ayame Ayer