Parts Geek - For 1975-1978 GMC P35 Thermostat 21673ZD 1976 1977. 1975-1978 GMC P35 7.4L V8. 1975-1978 GMC P35 4.8L 6 Cyl. 1975-1978 GMC P35 5.7L V8. Ensure Proper FitTo confirm that this part fits your vehicle, enter your vehicle's Year, Make, Model, Trim and Engine in the Compatibility Table.
