The 6.0L LS Swapped Ratty Muscle Lemans may not be safe, solid, or legal to drive on the street yet, but it does easily melt the tire(s) quite easily. I’m probably going to pull the differential cover soon to see what’s inside. Could it be a well worn Posi? Open differential? Who knows! The one thing that I do know is… it will be documented on video for your entertainment.