The 3600 had an 87" long bed. 3100 bed is 78" inside. Maybe someone put a short bed on it. Just like they put 3100 emblems on the hood.

1952 Chevy Vehicle Information Kit


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.