Repairs to both differentials

Have a 99 JGC with AWD. After a differential fluid service with all the best synthetics and additives (dealer recommended), the front diff started singing like a bird within two weeks. Ended up changing a bearing. That was about two years ago. Last week, dealer changed the diff fluids again, and two days later the rear diff started to sound like an airplane. Is there any correlation between the fluid change and bearing or gear damage or is it just coincidental and expected wear over time? I sure hope thay know how to service the level after removing the rear plate to remove old fluid! Jeep has 120K miles and I have never towed anything with it.

Sounds like there is a correlation betwen taking it to that dealer and your bearing/gear damage.

I'd find a new shop to do your work - because just putting in fresh fluid shouldn't cause damage.

I hope fredjacksonsan is right, I just bought $40 in Synthetic differential fluid.

I've done the same, though haven't installed it yet.