What is the difference between square-body and OBS?
Quick Answer
Square-body is the enthusiast name for the 1973-1987 Chevrolet C/K trucks, with their boxy lines. OBS, "Old Body Style," is the 1988-1998 GMT400 trucks that followed. Both wore the Silverado trim; the OBS drives more like a modern truck, the square-body has the vintage look.
Two consecutive generations, two nicknames.
Square-body (1973-1987)
Boxy, simple, hugely popular now, with the deepest parts supply in the classic truck world. The most collectible body is the short-bed Fleetside.
OBS (1988-1998)
The GMT400, more aerodynamic and comfortable, with the extended cab and fuel injection. It is the value entry and the daily-drivable classic.
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