you don't have the same thrust issues with an automatic transmission that you would have with a clutch. crank end play wouldn't show up as readily.
When you pull the flywheel can you see any marks on the block where anthing might be rubbing?
You can try pulling the spark plugs and turning the engine while pushing the crank all the way forward and see if you can find where it hits. Do it with the flywheel off and see if any noise or resistance is coming from inside of the block.
maximum serviceable run out should be about 0.010"