Sierra — GMT400 (1988–2000) → 1999 ✓ Factory-verified internal ⛭ GM factory document — 1999 gmc gmc c pickup 2wd rpo code list, p.1.
Suburban — GMT400 (1992–1999) → 1999 ✓ Factory-verified internal ⛭ GM factory document — 1999 gmc gmc suburban 2wd rpo code list, p.1.
Yukon — GMT400 (1992–1999) → 1999 ✓ Factory-verified internal ⛭ GM factory document — 1999 gmc yukon 2wd rpo code list, p.1.