Took my transmission to the shop, they had taken all gears off the shaft and reassembled the trans. The guy at the shop said 5th gear was stuck as he was trying to take it off, because it was not aligned correctly. He says there are alignment marks for 5th gear, if its misaligned it puts pressure on the 5th/reverse shaft so it allows 5th to go in but not reverse. I put it back in the car and wellah! Nice to have reverse again.