[wxboy]

Well I plowed today and I'm still a little uncertain as to whether the rough feeling is normal but I feel a bit better after davkir and RalphVa's posts.

Driving down the driveway on top of the snow before I plowed I didn't notice any vibration. I did notice it after I would plow a section and then back up on the same plowed path. So it feels strange to me but for now I'm going to assume it's normal and see if I notice any change over the rest of the winter. Most likely it's normal(I hope).