Buick, Chevrolet, Ford, Pontiac... Differential Ring and Pinion - Yukon Gear and Axle - YG GM12P-390

Ring & Pinion Set
YG GM12P-390
,12P,3.90,3.91,DIFFR&PGM123:90,fits 3.90& down case,GM,GM12-390,R&P,YG,
88-55BUI/CHV/PON/FRD
High performance Yukon Ring & Pinion gear set for GM 12 bolt car in a 3.90 ratio
Yukon Ring & Pinion sets give you the confidence of knowing you’re running gears designed for the harshest of conditions. Whether it’s on the street, off-road, or at the track; Yukon ring & pinion sets deliver unrivaled performance & quality. Yukon uses the latest designs and manufacturing technologies to provide a quiet running gear that is strong and easy to set up. All Yukon ring & pinion sets come standard with a one-year warranty.
12P GM 3.91 R&P (fits 3.90& down case)
Yukon Gear & Axle high performance ring & pinions set the standard for quality. Yukon designed the gear tooth surface finish to reduce friction and heat, and use high grade steel in both the ring & pinion, with fitment designed to OEM spec
Yukon Gear & Axle high-performance ring and pinion gear sets are the benchmark of quality in the automotive gear industry. Yukon engineers use state-of-the art design, advanced heat-treating techniques, and leading-edge quality testing processes to ensure the structure and surface finish meet exacting specifications and quality standards. Yukon offers its Y.E.S. Plan, a lifetime, comprehensive, no-questions-asked protection plan covering your gear set for as long as you own your vehicle. Whether you’ve added tons of horsepower under the hood, upgraded to bigger tires, are just want to optimize the traction performance of your ride, Yukon offers the widest selection of gear ratios on the market to accommodate every need.
Fits GM 12 bolt passenger car
8.875" ring gear diameter
12 ring gear bolts
30 spline pinion
3.90 ratio