I have an 83 K10 with the 6.2 and a 700r4. I have had it for almost 5 years now and done nothing to it but change fluids and filters. Mine was a former airport truck (from 1983-2005), and I personally witnessed it get the living hell beat out of it day in day out for several years and it never missed a beat. Plus it gets 19-20 mpg on the highway. They get a bad rap because people compare them to late model, turbocharged Cummins, Internationals, etc. That's like comparing apples to oranges. It isn't a modern design, it's not turbocharged, and therefore lacks the power advantages of more modern engines (just like anything else). Also, people often lump these engines in with the garbage 5.7 diesel, when in fact, the 6.2 was a ground up design from Detroit Diesel. I wouldn't recommend one if you're looking for a ton of power, but for a good running older truck that gets better mileage than the gas version, you'd be fine.