OER Parts offers a wide selection of Oil System & Parts for your 1977 GMC G35. OER Parts offers 1977 GMC G35 Bypass Valves, 1977 GMC G35 Dipsticks and Tubes, 1977 GMC G35 Filter Adapters, 1977 GMC G35 Oil Coolers, 1977 GMC G35 Oil Filters, 1977 GMC G35 Oil Pan Baffles, 1977 GMC G35 Oil Pans, 1977 GMC G35 Oil Pickup Tubes, 1977 GMC G35 Oil Pumps, and 1977 GMC G35 Oil Senders.