Ford 9R3Z-4R602-AA Drive Shaft Assembly

Raise the rear of the vehicle and support it securely on jackstands while blocking the front wheels. Mark the relationship of the driveshaft to the differential companion flange, then remove the bolts and separate the driveshaft from the flange. If equipped with a two-piece driveshaft, remove the center support bearing mounting bolts. Next, mark the relationship of the driveshaft to the transmission companion flange, remove the bolts securing the driveshaft flange to the transmission flange, and lower the driveshaft. For installation, reverse the removal process. If alignment issues arise due to rotation of the differential or transmission components, place the vehicle in Neutral or rotate one wheel to achieve the original alignment, then tighten the fasteners to the specified torque.

Raise the rear of the vehicle and support it securely on jackstands. Crawl under the vehicle to visually inspect the driveshaft for any dents or cracks in the tubing; if any are found, the driveshaft must be replaced. Check for oil leakage at the front and rear of the driveshaft, as leakage where it enters the transmission indicates a defective rear seal, while leakage at the differential suggests a defective pinion seal. With an assistant turning the rear wheel to rotate the driveshaft, ensure the universal joints operate properly without binding, noise, or looseness. The universal joints can also be assessed with the driveshaft motionless by gripping either side of the joint and attempting to twist it; any movement indicates considerable wear. Additionally, lifting up on the shaft will reveal movement in the universal joints. Finally, check the driveshaft mounting bolts at the ends to ensure they are tight.