These estimates relate to changing the fluid in one differential only. The rest of the charge would be for the labor, unless you can do the job yourself. On average, you might spend between $75 and $175 to have the differential fluid changed, with about $25 to $75 of this for the fluid itself. It doesn’t cost a lot to change the differential fluid. RELATED: 5 Symptoms of a Bad Differential (Repair & Replacement Cost) Cost to Change Differential Fluid That’s why you want to change the fluid at regular intervals. As viscosity is lost, the internal gears of the axle become damaged. If the fluid isn’t changed when it should be, the fluid starts to break down. 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. The Danger of Not Changing Differential Fluid How Often to Change Differential Fluid
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