The syncros were reassembled first. Here's the trick: Lay the inner hub on a syncro stop ring, then engage the clutch sleeve over the hub. Drop in the three struts, then wind in a spring. Flip it and wind in the other spring, starting at another strut. The long side of the inner hub goes forward on both syncros (shift fork side of the 1-2 sleeve, and rounded side of the 3-4 sleeve).