APDTY 708611 Pinion Yoke Kit With Upgraded Oil Seal, Washer & Nut Fits Rear Driveshaft To Rear Differential (Solves Clunk Bump or Squawk Sound When Accelerating; Replaces GM 12470387) Fits Rear Driveshaft To Rear Differential Pinion See APDTY 708613 For The Front Slip Yoke (Verify Your Model) Helps Solve Clunk Bump or Squawk Sound When Accelerating Includes Upgraded Seal For Long Leak Free Life Includes New Pinion Nut and Washer