What will happen if you run the oil real low in the rear gear?

Running the oil low in the rear gear can lead to inadequate lubrication, resulting in increased friction and heat. This can cause premature wear of the gears and bearings, potentially leading to mechanical failure or seizing of the rear differential. Additionally, low oil levels can diminish the rear gear's overall performance and efficiency, risking costly repairs or replacements. Regular checks and maintenance are essential to prevent these issues.