Hello, I have a 1994 L3650. It's time to do a service for the first time since I've owned tractor. When I called about filters they needed to know if it's a DT, GST, or MT. Im not sure which it is. It has the dual stage clutch and shuttle shift. Hear selectin on right and handle on left to go forward or back. Could someone maybe tell me which suffix mine would be. I'm trying to save myself an extra trip into town to g