What gear oil for 2019 f450?
For a 2019 Ford F-450, the primary lubricants you’ll need are gear oils for the axles and transfer case, plus ATF for the transmission. Use synthetic 75W-140 in both front and rear differentials; 75W-90 synthetic gear oil in the transfer case; and the transmission uses Dexron VI automatic transmission fluid, not gear oil.
In detail, the exact specification can vary by axle configuration and whether your truck is 4x4, has an electronic locking differential, or a towing package. The owner’s manual or Ford’s official service information is the most reliable source. Below is a practical guide based on typical factory requirements for 2019 Super Duty trucks.
Axle and transfer case fluids: what to use
Below is a quick reference for the primary gear-lubricant needs on a 2019 F-450. Be sure to verify with your door jamb sticker or owner's manual, since some axles or transfer cases may have different fill requirements.
- Front differential: 75W-140 synthetic gear oil (GL-5) with friction modifiers if the axle has an electronic locking differential or LSD option. Ford commonly recommends a Motorcraft 75W-140 Synthetic Gear Lubricant for these axles.
- Rear differential: 75W-140 synthetic gear oil (GL-5) with friction modifiers if equipped with LSD or locker. Again, Motorcraft 75W-140 Synthetic Gear Lubricant is a typical Ford-approved choice.
- Transfer case: 75W-90 synthetic gear oil (some models may use 75W-140; check the manual). Most 4x4 Super Duty transfer cases are filled with 75W-90 synthetic gear oil by factory spec.
Using the correct gear oil helps protect gears under heavy load and cold starts, especially when towing or operating in extreme temperatures. If you tow heavy loads or live in cold climates, you may prefer 75W-140 in both differentials for improved protection.
Transmission fluid (not gear oil)
The 2019 F-450’s transmission uses automatic transmission fluid (ATF). Ford typically specifies Dexron VI ATF for the Power Stroke-equipped Super Duty. This is not the same as gear oil, so do not substitute gear oil in the transmission. Always use the recommended ATF for the transmission and follow the service interval guidelines.
Using the wrong fluid in the transmission can cause slipping, shifting issues, or damage. If you’re uncertain, consult the owner’s manual or a Ford service center.
Recommended brands and where to buy
To make it easy to source the right fluids, these brands offer Ford-approved or widely compatible options. Always confirm the product meets the required ratings (GL-5, 75W-140 or 75W-90, synthetic, and any Ford-specific friction modifiers).
- Motorcraft 75W-140 Synthetic Gear Lubricant (Ford OEM option for axles)
- Amsoil Severe Gear 75W-140 Synthetic Gear Lubricant
- Royal Purple Gear 75W-140 Synthetic (with GL-5 and friction modifier for LSD)
- Red Line Gear Oil 75W-140NS (synthetic)
Note: Always verify current Ford recommendations in your manual or with a dealer; fluid choices can vary by axle type or equipment package.
Summary
For a 2019 Ford F-450, expect to use 75W-140 synthetic gear oil in both front and rear differentials (with friction modifiers if you have a locker or LSD), and 75W-90 synthetic gear oil in the transfer case. The transmission uses Dexron VI ATF, not gear oil. Confirm exact specifications in the owner’s manual or with a Ford dealer, especially if your truck has unique options or towing packages.
Keeping the right fluids in the right places ensures optimal protection and performance for your 2019 F-450’s drivetrain, especially under heavy loads or harsh conditions.
Summary of takeaway: use the recommended synthetic gear oils for differentials and transfer case, and Dexron VI ATF for the transmission. Always verify with the owner's manual for your specific axle and transfer case configuration.
