Re: 401 vs 432 torque ratings???
I don't know a whole lot about DEF engines, but I believe it would be enough for me to go with a Gas engine.
If they ever brought back the 637 V-8 Gas, they would really need to work on the Fuel Mileage. I never did check it personally, but I believe the '71 637 that I drove only got about 5 to 7 all around. Although many times I would be maxed out at the full 46,000.
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Drove and owned many, but some of the more interesting ones were:
-'60 GMC 2500 Dump, 305 V-6
-'62 GMC 4000 Flatbed, 305 V-6
-'62 GMC 6500 Flatbed Dump, 478 V-6
-'67 GMC 7500 Box, 6V-53 Detroit
-'71 GMC 9500 Flatbed Dump, 637 V-8
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