Dura Grip 400-Lb Spring Kit W/Preload Plates GM 8.5/12P/12T Ford 8.8 Dura Grip Replacement 400lbs Spring Kit With Preload Plates GM 8.5 12P 12T Ford 8.8 Dura Grip 400lbs Spring Kit W/ Preload Plates (Replaces EAT29590) Yukon Gear & AxleYukon Dura Grip Replacement 400lbs Spring Kit With Preload Plates, for GM 8. 5 inch, 12P 12T 8. 875 inch 12 Bolt Passenger Cars & Trucks, 17 Spl. Corvette, GM 55P, Ford 8. 8 inch, D44 & M226 Nissan Titan. Includes 4 Springs & 2 Preload Plates. Features: Superior Strength: The Yukon Dura Grip Replacement 400lbs Spring Kit is designed to provide exceptional durability and strength, ensuring reliable performance for your GM 8. 5, 12P, 12T, and Ford 8. 8