Instead of greasing, you need to perform a rear differential fluid change. This is important for the health of your rear end. The frequency depends on your driving habits and conditions, but generally it's recommended every 30,000-60,000 miles (or more frequently if you tow heavy loads or drive off-road).
To change the differential fluid (NOT grease):
1. Consult your owner's manual: This is crucial. It will specify the correct type and amount of gear oil for your truck's rear differential. The wrong fluid can damage the components.
2. Gather supplies: You'll need a drain pan, a wrench to remove the drain plug, a new drain plug (often a crush washer is included or sold separately), a funnel, the correct type and amount of gear oil, and possibly a pump to fill the differential if you don't want to pour it directly.
3. Jack up and secure the truck: Use jack stands for safety. Never work under a vehicle supported only by a jack.
4. Locate the drain plug and fill plug: These are usually on the bottom and side (or top, depending on the axle type) of the differential housing. They're typically square or hex-shaped.
5. Drain the old fluid: Carefully remove the drain plug, letting the old fluid drain completely into the pan.
6. Replace the drain plug: Tighten it to the manufacturer's specified torque (found in your owner's manual).
7. Locate the fill plug: Remove it.
8. Add new gear oil: Use a funnel to add the correct amount of gear oil, as specified in your owner's manual.
9. Replace the fill plug: Tighten it to the manufacturer's specified torque.
10. Lower the truck: Carefully lower the truck from the jack stands.
11. Check for leaks: Inspect the area around the drain and fill plugs for any leaks.
Important Considerations:
* Safety First: Always use jack stands and follow safe working practices when working under your vehicle.
* Correct Fluid: Using the wrong type of gear oil can severely damage your rear differential. Refer to your owner's manual.
* Torque Specifications: Over-tightening or under-tightening the plugs can lead to damage. Use a torque wrench if possible and always check your owner's manual.
If you're uncomfortable performing this task yourself, take your truck to a qualified mechanic. It's a relatively straightforward job, but using the incorrect fluid or improper technique can cause significant damage.
