![]() ![]() If you do, the oil will not reach all the areas of the differential clutch. The differential clutch comes with a level plug from where you can check the level of the clutch fluid. A bad seal causes fluid to move from the former to the latter, hence, the reason why you’ll find gear oil coming out of the fill plug. ![]() This often means that the seal that separates the differential clutch from the rear differential has failed. In certain situations, you may see gear oil coming out of the fill plug when servicing the rear differential. However, if you remove the fill plug and notice that the fluid level is fine, you can move on to the differential clutch. This fix applies when you’ve confirmed that the fluid is indeed low. Once done, you’ll need to screw the drain plug back in and add some new oil through the fill plug. All you need to do is remove the latter and then remove the former to drain the existing fluid. The rear differential comes with a drain plug and fill plug that you can use to refill the oil. When filling it with fluid, it’s important to note that the rear differential side is separate from the differential clutch side. The differential assembly should always be properly filled. Improper filling during a pump replacement or gasket service.Oil leaking from the differential clutch and into the rear differential.An external leak on the differential clutch.There are a couple of reasons why the differential clutch fluid could be low. Service Engine Soon warning light or check engine light.Possible Symptoms of All-Wheel-Drive Problems You’ll get a C0407.64 code when the oil drops below its recommended level. It then activates the differential clutch pump when the pressure goes below 392 psi. This is when the appropriate system pressure has been reached. Ideally, the rear differential clutch control module will deactivate the clutch pump motor when the pressure reaches about 464 psi. Once the control module receives a signal that the rear axle is engaged or disengaged, it activates or deactivates the pump to control the delivery of hydraulic oil pressure. Depending on the type of car you drive, the rear differential clutch control module is located right next to this assembly and is mounted to the differential clutch pump. One side has the clutch and the other the rear differential. The rear differential assembly has two sides. It connects to a rear differential which then connects to the axle shafts that power the rear wheels. This is as good of a place as any to start when diagnosing all-wheel-drive problems. From where the transfer case connects to the front axle shafts, you have a driveshaft that goes to the rear of the vehicle. You’ll need to trace the problem before you try to fix it. When this happens, you’ll only have power going to the front wheels.
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