On the drivers side of the differential, towards the front, there will be a 1" circle, with a sunk in square spot in the center. This is where you put oil in. Use a 3/8" drive socket wrench to unscrew it. (it fits right in the square sunk in spot) WATCH THE KNUCKLES! It hurts if you bang them, trying to loosen the plug. LOL When you get the plug off, stick your finger in the hole, and see if your finger comes out with any oil on it. The oil needs to be filled to the bottom of that hole. When the oil starts coming out of the hole, then you screw the plug back in, and you are done. IF, the rear diff has plenty of oil in it, then you may have another problem, like (inner/outer) bearings.
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Replacing gears and/or bearings in a differental is not an easy project. You'll need a press. The positioning of the gears requires a great deal of precision. Shims are used to acheve the correct setting. Preload setting on the pinion bearings is critical. I would recommend leaving this one to the experts.
Hello, You have a chance to save the parts if you are low on differential fluid. Usually, the noise is the Good-Bye for the broken part. But a dry part can sometimes get lubrication in a turn by the oil slinging down the axle shaft and reaching the wheel bearing or carrier bearing.
The pinion bearing can make noise under a load, then let off when you are coasting. You may also want to check the U-joints on the driveshaft as they can make noise too! There may be a rust track or grease track on the undercarriage pan of your truck.
It will take a visual inspection or use of skilled hands to detect roughness in any of these assemblies. If differential fluid is added be sure to observe if it is a Posi-trac type locking differential which may use an additive.
A quick change oil place would be able to add most fluids to your truck. I hope my solution hel[s you.
If you have had the oils changed in the car,the wrong oil was put into the differential.It has to be for a limited slip diff.OR a friction modifier has to be added.Once the oil is changed,or modifier added,go to a big carpark(empty) and at full lock on the steering turn the car in figure 8's.Then do it in reverse.about 5 times each way.This spreads the diff plates with the correct oil and it should fix the noise.Do all this at very slow speed.Hope this helps
Hey First thing I always look for is cheapest thing to repair or look at .. Make sure your tires are not cupping .. or make sure they are wearing good and smoothe all the way around .. this can make a terrible noise if they are cupped or worn improperly.. then I would Jack up one side and shake the rear wheels make sure those bearings are tight feeling .. you should be able to tell if they are loose this way ... I dont know how many miles are on your van but usually the drive line is not the problem.. this is probably last thing you need need to shake and see if there is play in it.. Holler if you need more and thanks Jerry