1/28/2024 0 Comments Rear differential fluid![]() This differential is filled with high-viscosity oil, ensuring that the gear remains lubricated. The engine torque is then distributed across the axle with the help of the differential, which is a set of gears. However, rear- and four-wheel-drive vehicles have a transmission that’s connected to the drive axles with the driveshaft. In a front-wheel-drive vehicle, the differential is part of the transmission. If you are in doubt, talk to your local mechanic about what’s best for your vehicle. With either the front or the rear, the changing interval becomes more frequent if you are driving the vehicle harder or in extreme conditions. You will be changing both the differential fluid and transaxle fluid at the same time since they use the same fluid. The front differential usually shares a housing with the transaxle on a front- or all-wheel-drive vehicle, so it needs to be changed more often than the rear. The appropriate schedule for your vehicle can be found in the owner’s manual. With the rear differential fluid, you might only need to change it every 30,000 to 60,000 miles. The front differential fluid is usually replaced every 25,000 to 30,000 miles. Minimizing resistance in this component of the powertrain may have helped.The Danger of Not Changing Differential Fluid How Often to Change Differential Fluid Drop off the drained oil for recycling at the autoshop or county waste facility.Īfter driving 1000 miles, my fuel economy increased about 10% from 26-28 mpg.Replace the fill plug and tighten fill plug with a torque wrench to 20 lb-ft.Stop filling when oil drains out from the fill hole. Fill the rear differential through the fill hole with 1.40L (2.96 pints) 80W-90 gear oil.Yes, you can’t drive the car until tomorrow. ![]() Permatex Ultra RTV calls for 24 hrs of curing and exposure to air. Leave the fill hole open and do NOT refill with gear oil yet.Tighten cover bolts with a torque wrench to 17 lb-ft. Wait 1 hour before tightening to spec if using Permatex Ultra RTV. The rear wheels don’t seem to be engaged full time and the rear differential shouldn’t get as hot as other powertrain components. The 2007 Ford Escape rear differential is an open differential and power is electronically engaged by the vehicle computer. I used Permatex Ultra Black RTV Silicone Gasket Maker but any oil resistant gasket maker sealant should work. Apply silicone sealant in an alternating pattern to the clean differential case face that will seal with the cover.Clean the fill plug and remove the metal shavings that are stuck on the magnetic bolt.You can lightly sand the surface all around to get rid of any remaining sealant. Make sure to get the previous sealant off of both the differential case and cover. Clean the rear differential case face that touches the cover.Clean the rear differential cover and ensure that the breather vent is clear and moves freely.If you have the car in neutral on a lift with parking brake off, you can rotate the wheels by hand to expose hard to clean parts of the rear differential. When enough oil has drained, remove the top cover bolt and entire rear differential cover.Use a flat edge tool and mallet on the edge where the cover meets the casing to break the sealant and pry the cover loose.Keep the top bolt partly screwed in to prevent oil spilling everywhere when removing the cover. Leave the top cover bolt loose and remove the other 9 bolts.Loosen all 10 cover bolts (13mm or 1/2in hex) located along the edge of the rear differential cover.Remove the rear differential fill plug (3/8” rachet).Place an oil catch pan under the rear differential.Lower the spare tire to make accessing the rear differential easier.This is important for filling it with oil to the correct level. Secure the vehicle on level ground with a lift or equivalent jack stands.Proceed at your own risk! You are recommended to go to a certified dealer to service your vehicle. This axel has probably been periodically submerged in water from driving through hurricanes in South Carolina and flooded roads in Florida so it’s time to see its condition inside! The rear differential fluid has not been changed since it left the factory 15 years ago. I changed the rear axel differential fluid on my 2007 Ford Escape Hybrid with 222k miles. Materials needed: Linked products provided for reference.
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