How to Change the Transfer Case Fluid on a 2002 Silverado

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Chevrolet offered the Silverado in two-wheel- and four-wheel-drive variations during the 2002 model year. The four-wheel-drive Silverados rely on a transfer case to transfer the torque from the transmission to the front drive axle. The case contains internal lubricant, which you need to replace periodically as part of the truck’s regularly scheduled maintenance program. Replacing the fluid is no harder than changing engine oil; therefore, anyone with basic automotive repair skill can handle this task.

Things You'll Need

  • Drain pan
  • Brake cleaner
  • Socket set
  • 3 quarts Dexron III fluid
  • Climb underneath the Silverado with the drain pan, brake cleaner and socket wrench. Place the drain pan underneath the drain and fill plugs on the side of the transfer case.

  • Spray the area around the plugs, and the plugs themselves, thoroughly with brake cleaner to remove any road dirt or other foreign material from the surface.

  • Remove the fill plug with the socket set by turning counterclockwise until you can pull the plug off by hand. Repeat this for the drain plug below the fill plug.

  • Allow the fluid to drain completely, then insert the drain plug by hand. Tighten the plug with the socket set. Pour the Dexron III fluid into the fill hole until the fluid reaches the bottom lip of the hole. Reinsert the fill plug and tighten it with the socket set.

Tips & Warnings

  • General Motors recommends inspecting the transfer case fluid at every oil change interval and filling as needed. It's a good idea to have the transfer case fluid replaced every 30,000 miles when replacing the automatic transmission fluid.

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