* Specific Year and Model of the 9-inch: Ford used the 9-inch differential across many years and applications, and slight variations exist.
* Pinion Gear Size: The size of the pinion gear impacts the required clamping force.
* Installation Method: The process itself – whether using a crush sleeve or a pre-set shim – dictates whether torque is the only measure or if other techniques are required for final setting. Torque is a critical *part* of the process, but not the sole determinant of proper adjustment.
Therefore, you CANNOT rely on a single number found online. Attempting to tighten the nut to an arbitrary torque value without proper setup can severely damage the differential.
The proper procedure involves:
1. Using a factory service manual: This is crucial. A manual specific to the year and model of your vehicle will have the correct procedure and potentially torque specifications *as part of the overall process*.
2. Correct shimming: The pinion depth needs to be precisely set. This is done using shims and checking backlash. Torque is used after the correct shim is chosen.
3. Using a torque wrench: Even with the correct service manual information, this is essential for accurate tightening.
In short: Don't attempt this without the proper service manual and the necessary tools and experience. Improper installation can lead to catastrophic differential failure. Consult a professional mechanic if you are not experienced in differential work.
