Paint, Thunderstorm Gray

additional charge; GN0 in GM's other lists is a different part (rear leaf suspension); touch-up WA-633D

extra charge; touch-up WA-633D; GM prints a letter O here, and GN0 in GM's other lists is a different part (a rear multileaf suspension). GM Authority lists the paint code (checked 2026-10-07).

additional charge; the 2026 guide marks it built out for the model year; GN0 in GM's other lists is a different part (rear leaf suspension); touch-up WA-633D

printed GNO; GM's other lists print GN0 for a different part (rear leaf suspension); the 2026 guide change log removes it from the 4SA to 5SB color and trim pages; 2024: GM Authority 2024 changes page; touch-up WA-633D

touch-up WA-633D; the upfitter lists name it Barb Wire Metallic