You absolutely MUST consult a reliable service manual for your specific vehicle's rear differential. This manual will provide the correct torque specification and the proper procedure for installing the pinion seal. Using the incorrect torque can lead to seal failure, bearing damage, or even catastrophic differential failure.
Here's why you can't rely on a single number found online:
* Differential Variations: Dodge Ram 1500s from 2003 used different rear axles. The torque specification is specific to the axle type.
* Nut Size: The size of the pinion nut influences the torque required.
* Proper Installation Procedure: The correct installation process is crucial. This includes the proper preload on the pinion bearings, which is often checked and adjusted using a torque wrench and a dial indicator. This process is far more complicated than simply tightening a nut to a specific torque.
Where to find the correct information:
1. Factory Service Manual: This is the most reliable source. You can often find PDF versions online, but be sure it's the correct year and model.
2. Repair Manual: A reputable repair manual (like those from Chilton or Haynes) will also have this information.
3. Online Forums: While you can find discussions online, treat any single torque value with extreme caution. Never rely solely on forum information for this crucial step.
In short: Don't attempt this repair without the correct service manual. The cost of a manual is far less than the potential cost of a damaged differential.
