I put a gearbox back together with many new parts. The GB was supplied by someone else completely torn apart and in a box. Even the quadrant and cam plate had been removed which is rare. I assembled everything with new bearings checking for smooth movement throughout. I assume I indexed the cam plate and quadrant correctly because I can shift into all 4 gears...sometimes. The outer cover is off and shifting is done with a prybar on the quadrant. Turn the mainshaft by hand. sometimes I can get all 4 gears, usually it hangs up in one gear or the other. Everything is lubed well with #20 oil. The GB is mounted in a stand on the workbench. I've pulled it apart 5 times now and no clue as to the problem. If I loosen the indexing plunger the shifting will get a little bit better. If the GB is empty of gears it will shift up and down reliably. The shifter forks look good. The shift fork rod is slightly bent on the right side but very little. Any ideas?