I just want to thank everyone for their responses. It seems the group has given my trans a clean bill of health. The reason I asked this qustion has to do with my '75 280 and '99 C43 and this hill by my home. The '75 & '99 don't roll back, but the '95 always does. I was concerned that the trans was starting to fail. But from what the responses have been I shouldn't worry.