My L4701 HST only has about 200 hours on it. When doing some dirtwork with the FEL or mowing, I have started to notice a pop or clank when making a turn. It does it turning either left or right but only if in 4X4, not in 4X2. It is not a loud noise but I can feel it with my feet in the floorboard. For each turn there is only one pop, not a continuous popping like a loose lug nut. The rear axle lock is not engaged but I'm wondering if it is the rear axle making the noise? I took it into the dealer because warranty is about to expire but of course the service writer couldn't get it to make the noise while test driving. I then rode on the 3pt arms while he drove around and it finally did it once for him, I could feel it in my feet then too. Any ideas?