How to fix a noisy differential. Rear differential service the gears inside the rear differential are bathed in gear oil which lubricates the gears and bearings and cools them to prevent overheating. Every once in a while rear differential fluid replacement must be performed. A noise that is heard when the vehicle is taking a turn is usually due to trouble in the axle shaft or a problem inside the differential itself.
The fluid breaks down over time and metal filings from the gears and bearings collect in the fluid. Here are a few common noises that may come from the rear axle that need immediate attention. If you only hear noise when accelerating or decelerating you may have bad ring and pinion gears.
It provides 2 to 4 micron penetration into the surface therefore lessening heat and friction and quieting rear differential noise where applicable. However once the noise gets bad rebuilding or replacing the differential may be the best way to fix the noise. When applied the gear oil in the differential carries this engine and metal treatment to the asperities of the metals to form a covalent galvanic bond on it.
But there are times when a noise coming from under the car can be a serious matter. Chassis ears are small microphones that you can attach to different parts of a bad differential to check for noise. If the noise is coming from the parts numbered 2 you may have a problem with your carrier bearings.
Most are normal while the vehicle is in motion. This eliminates mechanical noise while at the same time keeping the gear teeth in contact with each other over the biggest possible contact area if the differential is set up correctly. If however the backlash is excessive there is a brief moment during which two gear teeth lose contact with each other before contact between the next two gear teeth is established.
A bad axle bearing is usually the main reason for. How to fix a noisy differential.
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