Just thought I'd mention a little tidbit of info about my cousin's F-250. He bought his bare bones tan F-250 new and '91 and has put 384000 on it over the past 24 years. It's a 4x4 with the 300, 5 on the floor, and rides like a buck board. However, the meticulously maintained driveline is still going strong with the help of wear items getting replaced when needed. Nothing internal has ever been touched. He runs 20w50 Valvoline in the engine and sae30 in the transmission. He told us Saturday that even if he gets something else he'll keep his old work truck just to have around when he needs something to take him through the woods...that seems almost daily for the old redneck