I have just been driving around Michigan trying out B2650 hsdc's to see if I could find one that I could imagine spending 3 or 4 hrs in tne cab blowing snow. I thought the first one I drove was broken when I put it in reverse at idle, the racket was so loud. I did learn that there is a different type of hst in the B's compared with the L3560 I have. There is no such racket in my tractor. A mechanical linkage versus a fluid linkage controlled by valves and solenoid (and maybe even that swash plate I wondered about the other day.) I had no appreciation for how bad the " hst whine" could be. In any case I don't know which the base L's have, but if you can conceivably make use of a grand L, the money is worth it.