I tore back into the torque tube 3 speed tranny, replaced both bearings and the rear bushing. When I reassembled the unit I have all the gears but when I tighten the input shaft cover it locks it up. I changed the snap ring with the old one but no go. Do I need a thicker gasket for clearance? I've been into these transmissions many times without this issue. Never put in new bearings, though. Thoughts?