Tranny Building V...

Now that all of that's done, the shift forks can be reinstalled. You have to locate the flat surfaces on the gears to place the forks. The forks go in first then the rods.
The shaft for the forks on the mainshaft slides in from the back (left) side of the case.

The main forks are first, then the countershaft fork next.

If you notice, the rod has a head on one end...that's the end that helps keep it from sliding into the case. This goes into the trap door on the front (right) side of the case.

There are allen plugs that help seal and hold in both shafts.