Hey everyone first post on this forum. Ive got a 2001 f350 with 156k on the clock. Im experiencing a shudder when coming to a stop from 1-2mph to zero and again when pressing on the accelerator. It almost feels like slack being let in and out somewhere in the suspension or driveline. Not a constant shudder or vibration just like a small shudder and thud. Nothing audible, i feel it in the seat and my feet. Any ideas on where to start?