How to Change the Rear Differential Fluid on a Dodge Ram

Written by robert bayly
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How to Change the Rear Differential Fluid on a Dodge Ram
You can change the gear oil in the Dodge Ram rear end. (Jupiterimages/ Images)

The rear differential fluid, also called gear oil, is an often overlooked maintenance item on the Dodge Ram. The 2007 Dodge Ram owner's manual recommends you change the gear oil in your rear end every 30,000 miles. It's not difficult, and the task can be completed in about an hour.

Skill level:
Moderately Easy

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Things you need

  • Drain pan
  • Ratchet and socket set
  • Putty knife
  • Gasket sealer
  • Differential cover gasket
  • Wrench set
  • Gear oil

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  1. 1

    Park the Ram on level ground and set the parking brake.

  2. 2

    Place a drain pan under the rear differential, which is in the centre of the rear axle.

  3. 3

    Remove all the bolts from the differential cover, except for the top three bolts, with a ratchet and socket. Loosen the top three bolts until they are about halfway out. Pry the differential cover loose by inserting a putty knife between the differential cover and the differential. Allow the gear oil to drain into the drain pan. Remove the three top bolts and remove the differential cover.

  4. 4

    Remove the differential cover gasket from the cover, and scrape any remaining gasket material from the cover and differential. Wipe the surfaces of the cover and differential with a shop rag. Wipe out the bottom of the differential housing with a shop rag.

  5. 5

    Apply gasket sealer to the differential cover. Press the new cover gasket into place on the cover. Apply gasket sealer to the side of the gasket facing away from the cover. Line up the bolt holes, and install the differential cover and bolts with the ratchet and socket.

  6. 6

    Remove the filler plug on the front of the differential housing by using an open-end wrench. The filler plug is on the driver's side of the differential, behind and below where the driveshaft connects to the differential.

  7. 7

    Fill the differential with gear oil until it pours out of the filler hole. Replace and tighten the filler plug.

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