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before the D60 came out.. one ton trucks had d44 front ends.. /forums/images/graemlins/thumb.gif
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The first factory K30s were made in '77, and they came with Dana 60s. Prior to that, any one ton 4X4 was an aftermarket conversion, and they probably did have Dana 44 fronts.
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It's not the front axle that determines if it is a 1 ton or not, it is the GVWR that distinguishes that. Most of us don't consider them one tons just because it didn't have a D60 under it but that isn't what matters when it comes to vehicle weight class, it's the amount of weight it can haul/tow. I agree that it doesn't seem to be a 1 ton but all we wan't iss heavy parts and get used to seeing only a D60/14BFF combo as "1ton" but "1ton" has to do with weight handling and not axle combos.