J-Mech, I field installed the pto in my T-340, there was no splitting required. The tractor had the fast reverser, that was the only thing the dealer had to know along with the serial number of the tractor, the pto came ready to install, it was a very simple job, I did it in the field.
IH offered two types of pto's for the T-340, a Clutch Type (Rockford) and a Planetary Type.
Rodney, good luck finding a pto, there was one on this forum a long while back for a T-340. If you find one be sure to get the linkage for engagement, those kinds of pieces are usually hard to find.