Truck will slightly surge forward when my foot is on the brake and at a stop.

there you go. nice catch. Roy

I fixed the problem believe it not by removing the rear section of the driveshaft and lubricating the slip yoke. I met a guy at Napa who said he chased this problem for 3 years. He was told all of the same stuff I've been told, transmission, rear end, spring hangers, fuel slosh, engine surge, etc. He said this fixed his problem. So I tried it. It worked like a charm. It has 100% solved the bump stop.