I've been searching for pictures, videos, and class specific details on my 1975 k20 silverado 3x3, but I've found little to no info on my body style. I think it's odd because I don't assume it's rare, is it? Is there someone out there that can help?

 

4 wheel drive pickups were not that commonplace in 1975. Most farmers, who are off road more then most, still used 3/4 ton 2WD pickups. So, yes your K20 is not that commonplace. Jeeps, RangeRovers and Toyota Landcruisers were used by most people back then.

 

Wikipedia, should have some info,engine/trans combos,etc