2004 Dodge Ram 3500 Pickup Owner's Manual - Page 351

MAINTAINING YOUR VEHICLE 351 NOTE: The presence of water in the gear lubricant will result in corrosion and possible failure of differential components. Operation of the vehicle in water, as may be encountered in some off-highway types of service, will require draining and refilling the axle to avoid damage. Limited-Slip Differentials in 1500 Model vehicles require that 4 oz. (118 ml) Mopar limited slip additive be added to the gear lubricant. Refer to Recommended Fluids, Lubricants and Genuine Parts for correct fluid type. The Mopar limited slip additive should be added to the gear lubricant whenever a fluid change is made. Ram 2500/3500 Model Axles DO NOT REQUIRE any limited slip oil additive (friction modifiers). Transfer Case Fluid Level Check This fluid level can be checked by removing the filler plug. The fluid level should be to the bottom edge of the filler plug hole with the vehicle in a level position. Lubricant Selection Refer to Recommended Fluids, Lubricants and Genuine Parts for correct fluid type. Manual Transmission Fluid Level Check This fluid level can be checked by removing the filler plug. If the level of the lubricant is more than 1/4" (6.4 mm) below the bottom of the filler hole while the vehicle is on level ground, enough lubricant should be added to bring the level to the bottom of the filler hole. 7