the shaft you mention is actually a shaft with in a shaft.
The TV shaft is inside the shift shaft. There is a seal in the middle on the TV shaft. It can be replaced without removing the pan. Remvoing the nut that retains the lever and the seal is right there.
if the seal for the shift shaft is leaking, then you can some times dig the seal out nd replace it. Or remove the pan and valve body to get the shafts out and replace the seals to avoid cutting them doing it the short cut method
I gotta sign this too?
Dont worry how old you are... it is the mileage on your body that adds up.