Motive Gear Ring and Pinion Engineered. A division of Midwest Truck and Auto Parts, Motive Gear offers the highest quality drivetrain components on the market today. With a broader line of ring and pinion gears than any other aftermarket manufacturer, Motive Gear is the number one choice for distributors world-wide. More than just ring and pinion gears and differential bearing kits, Motive Gear offers a complete line of transmission parts and transfer case parts as well as replacement axle shafts. Along with Motive Gear's performance and axle divisions; Motive Gear Performance and TEN Factory, there simply isn't a better value in drivetrain components.