This check is only required on models through 1973; later models are permanently lubricated.
- Clean the area around the filler plug.
- Remove the filler plug. The level of lubricant should just cover the worm gear.
- If it is necessary to add lubricant, use SAE 90 Gear Oil. In extremely cold weather use SAE 80 Gear Oil or dilute SAE 90 Gear oil with a small amount of SAE 10W engine oil to decrease steering effort.
- Install the filler plug.