![]() ![]() Any nicks should be evaluated to be replaced. Are all the teeth still noticeably perfect on the ring and pinion? Rotate to verify.Are there metal shavings in the oil? A lot can be an issue a little is common.Once the oil has drained, undo the rest of the diff cover bolts and take off the cover.Keep the bolts as mentioned in option B, to keep the oil contained in the bucket. Be gentle to not scar the housing or the cover. If you unscrew the bolts and the oil isn’t draining, you will need to gently use a screwdriver to help release the pressure between the gasket and the diff cover.Once it has stopped draining, proceed to take out all the bolts. As you work up around the housing, don’t take the bolts out all the way just enough to create a containable drain area, leaving the top bolts in place. If there are no oil drain holes, begin unscrewing the diff cover housing bolts.If there are multiple oil drain holes, open the fill hole at the top and then open the drain plug at the bottom letting the oil drain.Open the cover to drain the gear oil, being aware of where the oil goes.Gear oil smells awful and is a challenge to get out of clothes. Consider changing into clothes that are ready to be thrown away. ![]() Gather a large catch pan, rags and the appropriate size tools for the oil plug.Drive the vehicle for a few minutes, warming up the gear oil.You can use a clean magnet stick to put down into the oil to see if there are shavings. The second part of checking the diff fluid is to see if it looks milky meaning water has gotten into the oil or if there are any metal shavings at the bottom, identifying an issue with your gears. If you open the oil plug and you can see fluid, then it is fine. Some have an oil plug that is at the fill line, others have covers that aren’t significant to the fill level. The significant difference is the diff cover. Sometimes you have the opportunity to check your fluid and sometimes you don’t. It can be changed around 30,000-36,000 miles, or in some cases, it may be as frequently as every 15,000 miles. Differential fluid needs to be checked and changed regularly. The fluid is held inside the housing of the axle. Differential fluid is gear oil that helps lubricate the gears, ring, and pinion within your rear and/or front lockers. Differential Fluid is as important as engine oil and radiator coolant, but it isn’t as familiar to understand how to check and replace. ![]()
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