OK, I figured out it wasn't seated correctly. Did a little digging on the net and based on that pulled the circ clip to see if it would fit. It did, so at least I had the correct part. Compressed the circ clip a little and replaced it, the after making sure everything was lined up, "persuaded" it 'till it seated correctly. Persuasion involved a block of wood and a 3# hammer. Filled the gear box with fresh oil and checked for leaks. Everything was tight so I reassembled everything and took it for a test drive. Seems to be working perfectly (knock on wood).