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The Zone Offroad 5‑inch system for 2011–2019 GM HD trucks is listed as a suspension kit offering 5 inches of lift without overload components in the Fox Advanced Series configuration. It is described as a vehicle‑specific lift solution for those heavy‑duty GM applications, supplying the components necessary to achieve the indicated ride height change for the stated model years.
Zone Offroad 11-19 GM HD 5in System w/o Overload - Fox Adv Series
