Raise the Vehicle

• 1). Insert blocks on the front side of the front tires.
  
  
• 2). Position a floor jack under the rear differential and raise the vehicle.
  
  
• 3). Readjust the blocks in front of the front wheels, and block the backside of the front wheels, ensuring the vehicle cannot move.
  
  
• 4). Place the jack stands under each axle tube, close to the wheels, and let the vehicle down, safely, onto the stands. Remove the jack.
  
  
• 5). Return to the front of the the vehicle, and place the jack under the front, center frame section, and raise the front end.
  
  
• 6). Set two jack stands under the front frame, one under each side, near the wheels.
  
  

Remove the Differential Oil

• 1). Unscrew the drain plug in the rear differential, but don't completely remove it. This may require inserting a half-inch breaker bar into the plug.
  
  
• 2). Place an oil drain pan under the rear differential, and remove the drain plug. Let all the oil drain.
  
  
• 3). Reinstall the drain plug, and tighten.
  
  

Replace the Rear Differential Oil

• 1). Replace the bottom drain plug or rear cover, whichever method was used to drain the oil.
  
  
• 2). Remove the level plug that is near the center of the rear differential. Refill the gear lube through this hole. Fill it, until oil runs out of the hole.
  
  
• 3). Thread the level plug back into the differential, and tighten it.