Motive Gear Motive Gear is a manufacturing industry leader in professional quality, high performance ring and pinion sets. The superior quality of these gear sets is the result of years of racing development, outstanding design, and state-of-the-art manufacturing methods. Motive Gear performance products can often be found in the winner's circle at NHRA, IHRA, ANDRA, SODA, SCORE, and NASCAR events. Application: 1983-2014 Ford 8.8" Rearend Ratio 3.90 Pinion Splines: 30 Rear Cover Bolts: 10 Ring Gear Diameter 8.8"