This is from the '54 GMC shop manual; it may not be correct for '51. :confused:

The 250 is a 1-ton and came with 5.14:1 rear gears. The 280 (1.5 ton) came standard with 5.14:1, and had a 6.17:1 option. 280's have bigger axles.


1955 First Series GMC 250 1-Ton Panel
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