Pitman arm nut and lock washer for attaching the pitman arm to the steering gear box. Replacement for 5667628. For manual or power steering. Compatible with many GM vehicles from 1982-2021 including: 82-84 Buick Electra, 82-89 Buick Estate Wagon, 82-85, 88-90 Buick Lesabre, 82-87 Buick Regal, 82-85 Buick Riviera, 91-96 Buick Roadmaster, 87-92 Cadillac Brougham, 82-84 Cadillac Commercial Chassis, 82-84 Cadillac Deville, 82-85 Cadillac Eldorado, 99-00, 02-06 Cadillac Escalade, 82-85, 93-96 Cadillac Fleetwood, 82-85 Cadillac Seville, 85-02 Chevrolet Astro, 02-06 Chevrolet Avalanche, 85-05 Chevrolet Blazer, 85-86 Chevrolet C10, 88-99 Chevrolet C1500, 85-86 Chevrolet C20, 88-00 Chevrolet C2500, 85-86 Chevrolet C30, 88-02 Chevrolet C3500, 82-90, 92 Chevrolet Camaro, 82-96 Chevrolet Caprice, 82-87 Chevrolet El Camino, 96-21 Chevrolet Express, 85-95 Chevrolet G10, 85-96 Chevrolet G20, 85-96 Chevrolet G30, 82-85, 94-96 Chevrolet Impala, 85-86 Chevrolet K10, 88-99 Chevrolet K1500, 85-86 Chevrolet K20, 88-00 Chevrolet K2500, 85-86 Chevrolet K30, 88-00 Chevrolet K3500, 82-83 Chevrolet Malibu, 82-88 Chevrolet Monte Carlo, 85-89 Chevrolet P20, 85-99 Chevrolet P30, 87 Chevrolet R10, 87-88 Chevrolet R20, 89 Chevrolet R2500, 87-88 Chevrolet R30, 89-91 Chevrolet R3500, 82-04 Chevrolet S10, 99-10 Chevrolet Silverado, 85-14, 16-19 Chevrolet Suburban, 95-06 Chevrolet Tahoe, 87 Chevrolet V10, 87 Chevrolet V20, 87-88 Chevrolet V30, 89-91 Chevrolet V3500, 85-86, 88-99 GMC C1500, 85-86, 88-00 GMC C2500, 85-86, 88-00 GMC C3500, 85-95 GMC G1500, 85-95 GMC G2500, 85-95 GMC G3500, 85-01 GMC Jimmy, 85-86, 88-99 GMC K1500, 85-86, 88-00 GMC K2500, 85-86, 88-00 GMC K3500, 85-89 GMC P2500, 85-90 GMC P3500, 87 GMC R1500, 87-89 GMC R2500, 87-91 GMC R3500, 82-91 GMC S15, 85-02 GMC Safari, 96-21 GMC Savana, 99-10 GMC Sierra, 91-04 GMC Sonoma, 85-99 GMC Suburban, 91 GMC Syclone, 92-93 GMC Typhoon, 87 GMC V1500, 87 GMC V2500, 87-91 GMC V3500, 92-14 GMC Yukon, 03-09 Hummer H2, 82-84 Oldsmobile 98, 91-94, 96-01 Oldsmobile Bravada, 82-92 Oldsmobile Custom Cruiser, 82-88 Oldsmobile Cutlass, 82-85 Oldsmobile Delta, 88 82-85 Oldsmobile Toronado, 82-86 Pontiac Bonneville, 92-90, 92 Pontiac Firebird, 82-87 Pontiac Grand Prix, 83-86 Pontiac Parisienne, 87-89 Pontiac Safari.