Replacing Front Seal on a 727

Point and counterpoint...
I know from experience that pulling the trans isn't easy without a vehicle lift. You would need some very tall jack stands and a trans lift and so on. I also know from experience that if you own a cherry picker you can snatch the engine out and use the K member as a seat while servicing the front of the trans.

If the one seal has failed they are all subject to failure ( all the same age after all ). The selector shaft seal is the booger. If you don't pull the trans and replace that seal too, odds are you future post will read, " Where to add a hole in the floor pan for selector shaft seal replace? "
So tell us what tools you have and don't have available. We'll get'er done one way or the other.