Climber,
Just like a truck in 4wd. Hard surfaces are hard on the tires and differential. With my Ram pickup, I've felt the front end lock up slightly and the front tires are pushed on dry pavment. Feels very wierd. So, I've learned to be carefull on dry pavement with my truck.
With a tractor, I believe it's even tougher. You can feel the tractor lug somewhat when making a sharp turn on hard pavement. I usually notice this after my wife or daughter drives the JD. The 4wd lock is located on the left footboard just at the bottom of the fender. They must just lift their heels up, pull their foot back, and stomp on the lock petal. They don't even know that they do it. I just mumble to myself and unlock the silly thing. /w3tcompact/icons/crazy.gif Women!! /w3tcompact/icons/wink.gif
Terry