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Guide to Assembling the Tamiya Double Gearbox- 38.2:1 Gear Ratio
Step 4 - The Remaining Gears

Step 6 - The Motors

Step 5 - The Second Half

Place 2 of the brass eyelets into the holes of the middle piece of the housing as shown in the picture..
Locate the right side housing part (should be the last part left) and the last 2 brass eyelets. Place the eyelets into the holes 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 left hole as shown.  Place the round steel axle in the right hole as shown. The short side of the 2 axles should now be about lined up with each other
Find the yellow G4 gear, it has a hex shaped protrusion on one side that will fit onto the gear hub on the hex axle.
Slip the yellow gear onto the hex shaft as shown. Be sure to align the set screw with the slot in the G4 gear. You should be able to clearly see the set screw. If not, rotate the gear until set screw can be seen.
Select another blue G3 gear.
Place the blue G3 gear onto the round steel axle as shown in the picture. The teeth of the smaller gear on the G4 should mesh with the teeth on the larger gear on the yellow G4 gear.

Find the yellow G2 gear. This gear has teeth on the face instead of the edge,

Place the yellow G2 gear onto the hex shaft as shown in the picture. The small gear on the G2 should mesh with the larger gear on the G3.
Find the small aluminum spacer - refer to the picture.
Slide the spacer onto the round steel axle as shown in the picture. The space slides up against the blue gear.
Now we can slide the 2 housing parts together. Make sure the 2 axle holes in the middle housing section have the brass eyelets in place so the axles will fit into the brass eyelets and not into the plastic.

 

Find 3 of the 18mm coarse threaded screws like the one shown in the picture.Getting Started in Hobby Robotics

Place the 3 screws into the holes on the outside housing as shown in the picture. There are actually 4 holes but only 3 will accept the screws. The fourth hole is under my thumb in the picture.
Step 4 - Unpacking the Parts

Step 6 - The Motors