What kind of fluid does a Ford rear differential take?
The rear differential is a critical component of your Ford vehicle, responsible for transferring power from the engine to the wheels while allowing them to rotate at different speeds. To keep it functioning smoothly, it’s essential to use the correct type of fluid. In this article, we’ll explore the types of fluids commonly used in Ford rear differentials and provide guidance on how to ensure your vehicle stays in top condition.
Understanding Rear Differential Fluid
Rear differential fluid, also known as gear oil, is a lubricant specifically designed to handle the high-pressure environment inside the differential. It reduces friction between the gears, prevents overheating, and protects against wear and tear. Using the wrong type of fluid can lead to premature wear, overheating, and even failure of the differential.
Recommended Fluid for Ford Rear Differentials
Ford vehicles typically require specific types of gear oil for their rear differentials, depending on the model and year of the vehicle. Here are the most common types:
- 75W-90 Synthetic Gear Oil: This is a common choice for many Ford vehicles, especially those with standard rear differentials. It provides excellent protection and performance in a wide range of temperatures.
- 75W-140 Synthetic Gear Oil: This is often recommended for Ford trucks and SUVs, particularly those used for towing or heavy-duty applications. It offers superior protection under high-stress conditions.
- Limited-Slip Differential Additive: If your Ford has a limited-slip differential, you may need to add a friction modifier or use a gear oil that already includes it. This ensures smooth operation and prevents chattering during turns.
Always consult your vehicle’s owner’s manual or a trusted mechanic to confirm the exact specifications for your Ford’s rear differential fluid. Using the correct fluid is crucial for maintaining performance and longevity.
Steps to Check and Replace Rear Differential Fluid
Maintaining your rear differential fluid is a straightforward process. Here’s how you can check and replace it:
- Gather the necessary tools: You’ll need a wrench, a drain pan, a fluid pump, and the correct type of gear oil.
- Locate the differential: The rear differential is typically located between the rear wheels, connected to the axle.
- Check the fluid level: Remove the fill plug and inspect the fluid level. It should be just below the fill hole.
- Drain the old fluid: Place a drain pan under the differential, remove the drain plug, and let the old fluid drain completely.
- Refill with new fluid: Use a fluid pump to add the recommended gear oil until it reaches the proper level.
- Replace the plugs: Reinstall the drain and fill plugs securely.
Regularly checking and replacing your rear differential fluid can prevent costly repairs and ensure your Ford continues to perform at its best.
Conclusion
Using the correct fluid for your Ford’s rear differential is essential for maintaining its performance and longevity. Whether it’s 75W-90 or 75W-140 synthetic gear oil, always follow the manufacturer’s recommendations and consult a professional if you’re unsure. At Kevin’s Autos, we’re here to help with all your car maintenance needs. Feel free to reach out to us for expert advice or service!
Frequently Asked Questions
What type of ATF does Ford use?
MERCON® transmission fluids undergo extensive testing, both in the lab and in real-world conditions, to ensure they provide optimum performance and durability. MERCON® fluids are the only fluids approved by Ford Motor Company for their recommended application.
Is gear oil the same as rear differential fluid?
Differential fluid, also known as gear oil, is designed for vehicles with manual gearboxes controlled by a clutch, pedal, and stick shift. Manual gearboxes are designed as a two-shaft system, and although this design gives manual cars more oomph, it produces an enormous amount of heat and friction.
Is there a big difference between 75W90 and 80w90?
SAE 75W-90 maintains a more consistent thickness, or viscosity, across a wide temperature range. It's thicker when exposed to high heat and thinner under colder, wintry conditions than 80W-90. The use of 75W-90 gear oil is recognized by OEMs as a contributor to overall fuel economy.
What fluid would most likely go in a rear differential?
The fluid used in a differential is typically referred to as gear oil, which has thicker properties than regular engine oils. Viscosity Grades: The '75' in '75w' stands for the oil's viscosity rating.
Which is thicker 75W90 or 75W140?
So, the difference between "75W90" and "75W140" is that at operating temperature, the 75W140 will be considerably thicker than the 75W90 but at room temperature they will be about the same viscosity.
What kind of gear oil does Ford use?
75W85 viscosity gear oils for F-150 front and rear differential gear oil XY-75W85-QL, WSS-M2C942-A.
What fluid should never be used in a rear differential?
Never, under any circumstances, put engine oil in your differential. This will result in devastating damages to your engine. Engine oil is much different than gear oil, mostly it cannot withstand high pressure.
What fluid should I put in my rear differential?
It's just a standard GL-5 gear lube that you need. 99.999% of the GL-5 gear lubes you'll find on the store shelves already contain the friction modifier additive.
How much oil does a f150 rear diff hold?
2.74 quarts
(Rear differential capacity 2.6 liters or 2.74 quarts).
Can you use 75w90 instead of 75W85 Ford?
Our answer: Yes, 75W-85 gear oil can most definitely be replaced by 75W-90.
