Enhance your vehicle's performance with the 423 Hubs conversion kit. Mile Marker Premium Locking Hubs are built for durability and reliability in extreme off-road conditions. Engineered with precision and tested for strength, these hubs offer superior performance for trucks and SUVs, ensuring that your vehicle is ready for the toughest challenges! Mile Marker hubs allow you to manually lock your vehicle into four-wheel drive and are built to last through all weather and terrain. Backed by Mile Marker Limited Lifetime Warranty, ensuring it is free from defects in materials and workmanship. Mile Marker Industries has been in business for over forty years, providing high quality, highly durable, hydraulic and electric winches, mounting systems, locking hubs, snatch blocks, shackles, tow and rigging ropes, recovery kits, vehicle accessories and more to off-road motorists. | Vehicle Compatibility: Fits 1974-1977 J20 Pickup, 1960-1977 3/4 Ton (K-20) Pickup, 1957-1968 1/2T W-100 Pickup, 1963-1977 3/4 Ton with 3500 Axle and 1956-1975 3/4 Ton Pickup.