A833 no shift

Check crankshaft end play, if your input shaft is bound up in the pilot bearing, or if the face of the bell housing is off(not parallel to the flywheel), then the crank will be thrust forward and it will have no float, it should move forward and rearward with little effort, if it springs back, or won’t move at all, do not run the engine, it will wipe out your thrust surfaces on the crank.