Jeep WK Quadra-Drive II, Popping Differential Noises

When moving in 4-Low, I would often hear a mysterious popping sound, though the Jeep performed as expected. Once I traced the sound to the rear differential, I wondered if a cure was as easy as fresh fluids. So far the answer is yes. Plenty of fluid drained out when opened up and it didn't look in bad shape... but I'm the Jeep's fifth owner and have no idea when the gear oil was last changed.

[@miguelfernandes7896]

It worked?

[@IanJefferys]

Yup! Worked great