Ford Full Size 4x4 Transfer Case fluids - Torque King.

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It's important to choose the correct Transfer Case fluid for your Full Size Ford Truck or SUV.It can be difficult to choose the correct fluid for your Transfer Case due to the changing lubrication specifications and service requirements.The latest version of MerconV fluid is not approved for use in 4x4 Transfer Cases.The chart below shows you the correct transfer case fluid for your vehicle.The transfer case fluids are very specific for later model years.Generic fluids should not be used in these transfer cases.For older transfer cases, you can upgrade to newer synthetic base fluids, but you should rebuild or at least replace the old seals because synthetic fluids may not be compatible with older seals.The chart was compiled using factory shop manual and specification guides.While we have made every effort to present accurate information, the information in this chart in no way supersedes or replaces the recommendations in your Ford Owners Manual, Shop Manual or other official Ford publication or specification list.

The Ford gear drive transfer case has a list of engine oils that can be used above and below 10F.The option of using SAE 90 weight mineral oil without extreme pressure additives above 10F is included in the early manual.It might be difficult to find straight mineral gear oil today.We recommend you stick to the original Ford fluid requirements in Dana 20, Dana 21, Dana 24, and NP 205 gear drive transfer cases.

The NP203 Full Time, Chain Drive Transfer Case must have engine oil.For the 1974-1977 model years, Ford lists the temperatures at which the engine oil can be used.Ford D8DZ-19C547-A standard transmission lubricates all Bronco and F250-F350 transfer cases.The Ford specification is ESP-M2C83-C.In 1992, D8DZ19C547A was replaced by F2ZZ-19 C547-A, a 80w manual transmission fluid.We had a lot of experience with NP203 transfer cases in the 1970s and 1980s, and our experience was that any fluid other than lighter engine oils would cause bearing problems and/or chain stretch issues.Both Dodge and GM specify 10w30 engine oil.We don't think the newer manual transmission fluids are compatible with the 1978- 1979 NP203 transfer cases, so we recommend you use Original Equipment recommended engine oils.Information on the Ford transmission fluid supersession is current.

Ford D8DZ-19C547-A Standard Transmission Lube is required for all Bronco and F250-F350 transfer cases.The Ford specification is ESP-M2C83-C.In 1992, D8DZ19C547A was replaced by F2ZZ-19 C547-A, a 80w manual transmission fluid.The NP 205 gear drive transfer case is tolerant of a wide range of fluids, which is different than the NP203 chain drive case.We would not be afraid to use the same engine oil that Ford specified for the NP205, even though Ford does not claim that XT-4-QGL or XT-M5-QS are backwards compatible.