Throttle Down Kustoms, Skid Plates / Transmission Crossmembers are built using 1 1/2" .120 tubing, and 3/16" CNC Laser Cut and bent mounting plates and a removable skid plate skin on the bottom, so you can do routine maintenance to your Jeeps Transmission and Transfercase with out the need of supporting the transmission and transfercase. The Universal Skid Plate is for a 1945 - 1975 Throttle Down Kustoms Frame. It is designed to move front to back in the frame and can be mounted by drilling 4 holes in the side of the frame and welding 4 sleeves in the frame to ensure the frame rail does not collapse under over tightening of the 4 bolts. The transmission mount in the Universal Skid Plate also moves front to back of the skid plate to let you weld it where you need it so you can put any motor and any trany in the 1945 - 1975 Throttle Down Kustoms Frames. This skid plate will work on factory 1945 -1975 Frame, if you box in the center section of the frame and may need other modifications.