[Matt Reiland]

First, you will take the flanged bearings (Teal Colored) and press them into the output stage gears (Green & Blue)(Ones that interface to the 3-finger Dog (Orange). Next, slide the shift shaft (Yellow) into the hole in the Hex Drive Shaft (Red). Next slide the three finger dog onto the hex shaft and pin it to the shift shaft.(Pin Shown also in Orange) Now slide the 2 output stage gears onto the hex shaft. Next put on the other 2 flange bearings (White & Purple) Onto the Hex Output Shaft (Red) Next weld the second stage onto the shaft (Shown in Silver above right to the output stage). Lastly press/weld the first stage onto the CIM motor.(Hard to see in the pic) Mount all three on one of the gearbox sideplates, add in the cross members, and attach the other gearbox side and POOOF you have a shifting gearbox.

Note: This is the extremely simplified instructions but assembling the box is pretty easy, making it is more difficult.