Pulled my B16 transmission out of my civic to replace the clutch and some bearings.

Basically tore the whole thing down to replace the input shaft bearing, but found out I was given the wrong bearing so I just put it back together without changing it.

I left all the gears on the shafts, but when I was trying to get them to go back in I accidentally popped the top gear set on the mainshaft off. Didn't press it or anything, just kinda put it it back together and reassembled the transmission.

I was instructed to take the shift fork off too and put grease on it, but I couldn't get it off so I just left it.

Now my car is really hard to get into third, especially when I punch it. All the other gears are fine, just third. Can anbody give me some suggestions?

 

Does anyone know anything about this?