That was a pretty good show. It looked like he popped the head gasket on the second run, which seriously over-pressurized the radiator and busted it. All of his coolant was gone by the end of the third run. They still had one pass to do so they just ran it dry. Sounds like that took its toll and really broke something hard, possibly from the heat, as it was knocking like crazy when they came back from that last run.
Sold: 1992, D350, Extended Cab, Auto, straight pipe, Banks Power Pack - Purchased in 1992, sold in 1995
Sold: 1995, 4X4, Standard Cab, Auto, striaght pipe, plate, timing - Purchased new in 1995, sold Sep 2003
Sold: 2003, 4X4, QUAD, LWB, Twins, Snow, Helix2, Hot Cp3, Injectors, 315s - 12.32 @ 109mph - Purchased new Sep 2003, sold Jan 2011
92 W250 Ext Cab 5 speed LE, 275k, 3.54's - Purchased slightly used Feb 2011