First off the gmc and chevy are the exact same truck more or less and the 1500 HD is a light 3/4 ton(gas hog), as far as best depends on what you do. the GM Engine and trans has proven to be the most reliable hands down. The 1500 series GM gets the best overall mpg and good power, but if you hammer it on rough roads you will be replacing front end parts more often then the others, (sometimes) the foreign trucks are a joke IMO. But these days they all are pretty sound in the 1/2 ton market up to 150000, the gm truck are good for over 200000 I've seen many go way past that. Fords just suck, after watching 3 freinds pop spark plugs out of the heads on the 5.4triton and having to replace major parts, no thanks, I also have yet to see any other engine failures in less than 150,000 on any of the others and have seen 4 5.4 tritons go down in the last year, usually just over 100,000.
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