AMC 20 3.31 Ring and Pinion Gears

3.31 AMC 20 3.31 ring and pinion gears. AMC 20 3.31 ring and pinion gears. This specific 3.31 ratio was a popular factory option in many 1976-1986 Jeep CJ5, CJ7, and CJ8 models (often with the 258 inline-6), providing a noticeable improvement in low-end torque and acceleration over the base 2.73 gears while maintaining reasonable highway RPMs and fuel efficiency for daily driving or light off-road use with stock to 31" tires. It fits the 3.07-up carrier design (as noted in AMC 20 carrier breaks) and is a solid choice for mild builds, towing, or restoring original performance without aggressive regearing. Browse a wide variety of AMC 20 ring and pinion options—including this Yukon Gear YG M20-331 3.31 set—to pair with installation kits, precision bearings, heavy-duty shafts, and traction devices for a smooth, reliable upgrade that enhances drivability on pavement or trails.