Part Type: Serpentine Belt. 1990 GMC K3500 Engine: 5.7L V8; w/o Air Pump; w/o A.C.; Position: Main Drive;. 1991 GMC K3500 Engine: 5.7L V8; w/o Air Pump; w/o A.C.; Position: Main Drive;. 1992 GMC K3500 Engine: 5.7L V8; w/o Air Pump; w/o A.C.; Position: Main Drive;.
