No question the older Cummins 5.9 is a tough diesel engine, if you can stand the noise, man those things are loud. Biggest problem the early Cummins/Dodge's had was lousey transmissions, be they hand shakers or especially automatics. The newer diesel engines made by anyone are very particular, especially with those carbon collectors or the urea tanks, along with the newer injectors, almost anything will cause them a problem. Actually, the lowest problems with diesel engines in the past 7 years goes to the Duramax. The GM pickup itself is lacking in quality and falls apart in hard use, but their Duramax is pretty dependable. The Dodge truck in heavy use doesn't jold up either. Most all of the pipeline welders I see have Dodge trucks, but the first thing they do is weld an extra plate along the frame so it won't collapse on them. Ford has the best all around truck as is whitnessed by their huge number on the road; very tough, but they have a big problem with their diesel engine history too, especially the 6.0, which was a disaster. Due to the EPA and Congress, to keep our air "clean", we sacrifice simplicity and dependability in all our combustion engines, but the pickup diesel engine suffers the most. That's why I went with a gasser in my latest 2008 F-250 and this V-10 has performed very well in 88,700 miles with alot of towing. The Ford Torqueshift transmission is fantastic, I love it.
2008 F-250 4X4 Lariat V-10
2002 Airstream Classic 30' w/SO #2074
2007 Kubota 900 RTV
1996 Ford Bronco
2007 Lincoln LT