Ford F-550 rims can be a bear to get off. The center of rim is an interference fit, the lugs just hold the rim on. My tire shop uses a torque stick to tighten them after using the gun. It's worse up here in New England,road salt, grime gets in there and the wheels will seize to the axle,tire shop just bought an expensive puller made to force the rims off when stuck, I drive a 550 for the highway dept, plowing and sanding the roads. There was a recall for crank position sensors, our truck was at dealers for two days getting it fixed. Oil pans can be a problem on 7.3 ,Ford advises painting the pan or replacement pan to prolong it. Our truck is on it's second pan, besides that ,I like the truck especially the powerstroke.......And finally I hope you get better, Mr Jimi. plowking