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Guide to Assembling the Tamiya Double Gearbox - 344.2:1 Gear Ratio
Step 2 - The Axles

Step 4 - The Remaining Gears

Step 3 - The Gearbox Housing

Locate the gearbox housing parts as shown in the picture. The parts need to be separated from the plastic frame.
Use a utility/hobby knife or a pair of closecut snips to remove each piece.  Clean off any excess plastic that may left where the parts were attached to the plastic frame.

Locate the left side housing part (use the picture as a reference) and 2 of the brass eyelets. Place the eyelets into the holes as shown in the picture. Also place 2 of the brass eyelets into the holes of the middle piece of the housing.

Place the long side of the hex shaft into the left side hole as shown in the picture.
Place the yellow G4 gear on the axle against the gear hub. Align the set screw with the gap in the raised edge on the G4 gear. The set screw should be visible with the gear in place.
Place 2 blue G3 gears onto the long part of the round shaft as shown in the picture.  
Place another G3 gear on the hex shaft as shown in the picture.  Position the round shaft assembly next to the hex shaft, making sure the G3 gear on the hex shaft is in between the two G3 gears on the round shaft.
Slide the gears and shafts into the chassis. Everything should fit snugly together.
 
Step 2 - Unpacking the Parts

Step 4 - The Remaining Gears