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Guide to Assembling the Tamiya Double Gearbox- 38.2:1 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 short side of the round shaft into the left side hole as shown in the picture.
Locate one of the blue G4 gears, using the picture as a guide.
Hold the short end of the hex shaft and slide the blue gear onto the long end as shown in the picture. Be sure that the large gear is facing the gear hub. The gear goes onto the long side of the shaft.
Slide the hex shaft into the right hole as shown.  The short side of the 2 axles should now be about lined up with each other. 
 
 
Step 2 - Unpacking the Parts

Step 4 - The Remaining Gears