Just the opposite. GM was genious in being the first to put a diesel in a light duty pickup in 81.
I bought an 82 K10 4x4 SP, auto, loaded, and that 6.2 was great, problem free till I sold it. But it was in a 1/2 ton, built for mileage. I turbo'd it, and it ran strong. I pulled a 29' TT camper with it. Pulled car trailers. I took that truck to Germany, and ran it on the autoban, all out. Bulletproof but light duty. I put a re-calibrated injector pump on it that turned 4100 RPM, and it REALLY ran great. Suprise a buddy on the autoban with a 85 Vette. Really liked that truck.Owned it for 14 years. Again as good as it was, it was light duty.
In 1984, GM sold the military on the 6.2 powered HMMWV and that's history. The HMMWV unfortunately today is still powered by it, and it has the longevity in the HMMWV of ice-cream in South Arizona.
Dodge took a tractor engine and introduced in about 1986 a 160HP/400TQ quiet little engine, in their 3/4-1 ton-- that 'was at-once' loved.
Ford in 1985/1986, thereabouts, but the 6.9L Internation in their pickups (3/4 larger) not so beloved, but morphed to the 7.3, to be sworn by.
Believe it or not in 1993, GM owned the HP ratings with the 6.5 intoduced in 92. But Ford and Dodge spanked GM in 94, which was the first year for electronic pumps on 6.5s, and 95/-97 Dodge and Ford uprated their engines with aftercoolers, etc, while GM flubbed along, till the Duramax was introduce.
Just think how much much money GM has made owning the 6.2/6.5 as long as they were in production and owning the Duramax vs bidding for an engine. Fleets were powered by these cheap engines.
GM spanked the market when they introduce the Allison 1000 with the Duramax. Genius.
GM did not tuck their tail and hide, from the 5.7L diesel debackle, they made a killing with the 6.2/6.5s. If diesel engines are too great, the engines last longer than the truck. GM married longevity with body, and move the market. Diesels junked with the truck. How many 350s were removed from boats and replaced with 6.2/6/5s. Many. Look up Peninsular Diesel.
Personally, I thought Dodge shaped the pickup truck history when they switched fromt the 93 square front ends to the retro curved fenders we see today. And they killed with the Cummins. But from a market prospective and profits, the engine lasts too long and simply is too good for the truck.
I say all the above in gest, whereas the timelines are close if not factual.
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