The question of PTO and ground speed comes up about 2 times a year when discussing repower options for the Gravely T heads.It's a non issue ! There is nothing keeping you from changing the governed speed to 2400 or even 2000. Governed speed does NOT mean you can't run it slower ! All engines have a throttle and the throttle sets the govenor on all the newer engines, and you will find the newer engines govenors respond almost instantly to changing loads. The cost of Gravely parts and the total operating cost is also a non issue. The gravely T heads are horrible on gas running at 2400RPM, yes they have ENOUGH torque to let you run them slower , but a new 13HP engine has more torque at any rpm than any old T head at the same rpm, and the newer engines absolutely sip fuel compared to the T heads. If you want to figure total cost of operation you have to add in fuel costs. It has been my personal experience using both the T heads and a modern Honda clone and a 12 HP Kohler, the new Honda clones/ real Hondas,use about 1/2 the gas of a Kohler 12hp and A lot less than the T heads at the same rpm. Don't try to compare a T head poking around at 1200 RPM to a honda at 3600. Run the honda at 1200 and you will outperform any T head and use far less fuel in the bargain. AND the new Hondas start in any weather even down to -40F here in Maine, and they start on the first or second pull everytime.You can buy a 8 -16HP clone for far less than a new cylinder and piston for a gravely and it will outperform any T head at any speed, and you get a new gas tank,new carb,new exhaust, new govenor, new everything , plus a real charging system to run lights and electric start that works every time.