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Some common issues with Hyundai Elantra axles involve leaks and gear damage in the rear differential. Gear oil is essential for lubricating and cooling the gears and bearings within the differential to prevent overheating. Over time, the fluid degrades, causing metal debris from the gears and bearings to accumulate. It's necessary to replace the rear differential fluid periodically to safeguard the ring gear and pinion gear from harm. This maintenance task entails removing the rear differential cover, cleaning out the old fluid, sealing the cover, and refilling it with fresh fluid. Typically, after a rear differential fluid replacement, most cars can go 20,000 to 40,000 miles before needing another change.
Issues with the Hyundai Elantra axle consist of leakage of fluid and also problems with the gears within the differential.