Where should I start to inspect for damage on a 19 spline dana 44? My 1960 seems to have a tight rear end. I suspect backing over some snowplow parts in the garage then pulling forward then back then locking the front hubs and dancing around in 4 low on concrete with a rear wheel bound up wasn't good for it. That or flat towing 200miles without oil. Visually the pinion seal is leaking about a 4" puddle in less than a week and I can't push it around on the level driveway anymore.