rear Main Seal noobie question

I have a sort of noobie question about the rear main seals on our cars. I have a 1970 Dart 340. I've had a small oil leak coming off of my flywheel cover now for a good while. A while ago I replaced the Oil pan and oil pan gaskets (Front and rear rubber pan gaskets as well) in hopes it would fix the leak, it didn't. I've been looking into how to replace the rear main seal on my 340. From what I'm seeing it looks as if all I need to do to replace the rear main seal is remove the pan, remove the rear main cap, and use something to push/pull the upper portion of the rear main seal out while rotating the crank and install the new one the same way with some RTV where the ends of the upper and lower seals meet. From what I'm reading and seeing in pictures it doesn't look like I NEED to remove the transmission. Am I missing some big part of this or do I have this down for the most part? Like I've said I've already removed the pan in the past so I know everything that goes into that job, I'm more concerned about after I remove it. More specifically if I NEED to remove the transmission. I understand it may be easier to remove the engine/transmission, but that's not an option for me right now unless there is no other way possible to do it. Thank you for any help