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Guide to Assembling the Tamiya Double Gearbox - 344.2:1 Gear Ratio
Step 5 - The Second Half  

Step 6 - The The Motors

 
Locate the small light purple spur gear - G1. There are 2; one for each motor.  
Place the G1 gear on end of each motor shaft as shown in the photo.  Slide it far enough on that it stays in place.
Hold the motor in your hand and place the G1 gear on a flat surface as shown in the picture. Press down on the motor until the motor shaft slide all the way through the G1 gear. The motor shaft should be flush with the gear. Repeat this process for the second motor.
Place the motor into the gearbox housing as shown in the picture.  The motor should slide into the slot easily and should be held in place by the plastic tab that hooks over the end of the motor.

 The motor leads should be towards the outside to make it easier to solder wires to them later.

Place the second motor into the gearbox housing. Make sure the motor leads are towards the outside when placing the motor.
Locate the plastic motor spacer. This piece slides in between the two motors to help secure them in place.

Note: If you will be installing capacitors on the motor to reduce noise, you will need to cut the corners off nearest the motor terminals to allow room to solder the capacitors to the motor chassis.

You now have a completely assembled Tamiya double gearbox with the 344.2:1 gear ratio!
Step 5 - The Second Half