79 and newer 727's

Just found this using Google....

• "You can identify A-727s as being the 1978 and newer lockup units by looking at the input shaft of the transmission. If the shaft is machined smooth for the last half-inch of the shaft, that transmission was equipped with lockup. Non-lockup transmissions are splined all the way to the end of the input shaft."

Sounds like at a minimum, (if what I have is a lock up style) the input shaft will need to be replaced.