2008 Dodge Ram 2500 Pickup Owner Manual - Page 478

476 MAINTAINING YOUR VEHICLE Manual Transmission Lubricant Selection G238 (6-Speed Manual Transmission - If Equipped) This transmission is filled with manual transmission fluid at the factory. This fluid does not require periodic changing. If it is necessary to add or change fluid in this transmission refer to Fluids, Lubricants and Genuine Parts for correct fluid type. This is the only lubricant recommended for use in the Getrag 238 transmission. Lubricant Selection G56 (6-Speed Manual Transmission - If Equipped) Follow the Maintenance Schedule for recommended transmission fluid change intervals. If it is necessary to add or change fluid in this transmission refer to "Fluids, Lubricants and Genuine Parts" for correct fluid type. This is the only lubricant recommended for use in the G56 transmission. Fluid Level Check - All Manual Transmissions This fluid level can be checked by removing the fill plug. If the level of the lubricant is more than 1/4 in(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. Automatic Transmission Selection Of Lubricant It is important that the proper lubricant is used in the transmission to assure optimum transmission performance. Use only manufacturer's recommended transmission fluid; refer to "Fluids, Lubricants and Genuine Parts" in this section for correct fluid type. It is important that the transmission fluid be maintained at the prescribed level using the recommended fluid.