Custom line is dropped and Custom Deluxe becomes base model. Cheyenne Super is replaced by Silverado as top trim level. Upper trim levels receive brushed aluminum panels on tailgate. Scottsdale line is also added to the 1975 line-up. C20 model was made available in a 4 door model minus rear seats. HEI ignition becomes available, catalytic converters were also made standard equipment on all trucks under 6,001 gross vehicle weight (GVW). 400 small block is available in 4x4 models and changes to the grille make it flush to the front and give it three horizontal bars.
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