USA Standard Gear ZG GM9.25-456R Ring And Pinion Set GM 9.25 in. IFS Reverse Rotation 4.56 Ratio Ring And Pinion Set Ring & Pinion gear set for GM 9.25" IFS Reverse rotation in a 4.56 ratio ZG GM9.25-456R Manufacturer: Yukon Gear & Axle Part Number: ZG GM9.25-456R