-YOU CAN GO TO https://dragbrick.com FOR THE PART NUMBERS FOR THE EXTRA PARTS, AND TO PURCHASE THE 4x4 KIT IF YOU DON’T HAVE THE PIECES. LEGO tutorial how to build Technic grave digger 42118 into a custom build 4x4 with two pullback motors! Also included is a drag race between two monster trucks, the 4x2 stock grave digger, and the new moc 4x4 truck!