Well, that is true. In 40 years my HO52 had a pinion pocket bearing fail and NAPA had it. Other than that it has only needed brake shoes & hardware and wheel cylinders, and fresh oil. I'll keep it and if it has a catastrophic failure down the road, I'll be asking the same questions you are!
Someone will ask to see pics of your truck, so it might as well be me. Love those K20s!