AMC 20 4.88 Ring and Pinion Gears

The 4.88 ratio is among the deepest and most aggressive aftermarket options for the AMC 20 rear axle in 1976-1986 Jeep CJ5, CJ7, CJ8, and similar models, providing extreme low-end torque, exceptional crawl speed, and powerful acceleration for dedicated off-road use—ideal for running 35-37" tires on moderate to heavy trail builds or 37-38"+ tires on rock-crawling or steep-climb rigs, though it significantly increases highway RPMs (often 3200-3800+ RPM at 65-70 mph depending on transmission, overdrive, tire diameter, and gearing setup). It requires the 3.07-up carrier (per AMC 20 carrier breaks) and is typically chosen for serious regearing after large tire installations to overcome power loss, dominate low-speed obstacles in rocks, mud, or extreme inclines, maximize towing capability in tough conditions, or optimize performance with manual or low-gear automatic transmissions—best suited for trail-focused vehicles where highway cruising is secondary and overdrive helps mitigate revs. Browse a wide variety of AMC 20 ring and pinion gears in 4.88 ratio from trusted brands including Revolution Gear (M20-488), Motive Gear (AM20-488), Yukon Gear, USA Standard Gear (ZG M20-488), Alloy USA, Crown Automotive, and others to pair with installation kits, precision bearings, heavy-duty shafts, and traction devices for a complete, robust regear that delivers unbeatable off-road performance and traction.