Aluminum Differential Rear End Cover With Buick Logo This is a "Rear End Cover with Buick Logo and Power 6" for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3.8 liter turbo V6. This is an aluminum cover for a GM 8.5" 10 bolt Buick Grand National rear end. Bolts and gasket are included. MSRP: Was: Now: $199.00 Add to Cart