AMC 20 3.73 Ring and Pinion Gears

The 3.73 ratio is one of the most popular aftermarket upgrades for the AMC 20 rear axle in 1976-1986 Jeep CJ5, CJ7, CJ8, and similar models, delivering significant low-end torque gains and improved acceleration over stock ratios like 2.73, 3.07, or 3.31—ideal for running 31-33" tires on mild to moderate off-road builds or 33-35" tires with more aggressive setups while keeping RPMs manageable on the highway (typically 2500-2800 RPM at 65-70 mph depending on transmission and tire diameter). It requires the 3.07-up carrier (per AMC 20 carrier breaks) and is frequently chosen for regearing after tire upsizing to restore power, enhance crawl capability in rocks/mud, or improve towing without excessive engine strain—often paired with an automatic or manual transmission for versatile daily/trail driving. Browse a wide variety of AMC 20 ring and pinion gears in 3.73 ratio from trusted brands including Motive Gear (AM20-373), Yukon Gear, Revolution Gear, Alloy USA, Crown Automotive, and others to pair with installation kits, precision bearings, heavy-duty shafts, and traction devices for a complete, durable regear that boosts performance and off-road confidence.