Well.. I got bored after school today so i decided to make a microsizer a 4x4. Here is what i did: 1) I attatched wires to the positive and negative sides of the battery. 2) I took out the steering mechinism(?). 3) Drilled holes for axle (I guessed where I should drill it). 4)Mounted a powerful motor (with hot glue) in the DIRECT front of the microsizer. I use a powerful motor like a 3.8 or ZZ's 3.0 because there is no secondary gear. 5) Glued and taped the wires leading from the battery to the proper areas of the motor. 6) Connected a micro switch to the negative wire so it doesnt run 4x4 all the time (switch can be connected to positive or negative). DONE, after a 15min. job you have a 4x4! And I'm only 15 so just imagine how fast you 20 year olds will be able to do this. This is my first attempt to attatch a picture so don't make fun of me if i screw up