Hey JD, My dad had a 79 GMC with the 5.7 diesel. We had relatively good luck with it compared to some others. It had the 3.40 rear axle ratio, which seemed help it out some although it did cut the milage down some. (best of 24 mpg with 19 or 20 normal for everyday driving) Dad also added a large fuel filter to it, a glass box one like many JD tractors used. Did blow the head gaskets once at 70,000+ miles. Despite it not being rated for towing, we sure hauled alot of farm machinery around with it. I also did a fair amount of hotshotting around with it when I was young. (could squeal the tires pretty good) Finaly gave up the ghost around 100,000 miles, when an olds gasser was swapped in it was about a 10 mpg truck.
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