88 alpha 1 gen 1 replaced inpeller "wasnt one" was completly wore out!! havent bolted gear housing back up yet,but i noticed when i installed impeller i could freely turn shaft to seat impeller in housing . now that its back together i cant turn shaft in either direction,but i can turn the shift selector to foward or reverse, when i turn the prop by hand the shaft doesnt turn and the prop will stop in either selected position.. if that makes any sense to yall,remember the gear housing hasnt been bolted back up yet. its in the garage!!! what went wrong???? 