Ford equipped the 2004 F-350 with a 5.4-liter, V-8 gasoline engine and ZF six-speed manual transmission as standard equipment. A 6.8-liter, V-10 gasoline engine and a 6.0-liter, diesel engine were optional. If you opted for an automatic transmission, you have either a four-speed 4R100, or a five-speed 5R110 Torqshift.
The ZF six-speed without the oil cooler takes 5.8 quarts of Mercon V automatic transmission fluid. The oil cooler holds an additional 17 fluid ounces. The 4R100 transmission with the 20-plate, oil-to-air cooler holds 17.1 quarts of Mercon Multi-Purpose ATF; with the 26-plate oil-to-air cooler, it holds 17.7 quarts. The 4R100 bolted to the 5.4-liter engine may require a few additional ounces of fluid if equipped with in-tank and oil-to-air coolers. The 5R110 Torqshift holds 19.2 quarts of Mercon SP Multi-Purpose ATF.
Ford launched a customer satisfaction program, No. 04B24-S3, to replace the reverse planet assembly in certain 2004 F-350 trucks equipped with the Torqshift transmission. Contact your Ford dealer to find out if your truck is eligible for repair under the program.