Transfer Case Fluid" replacement and "Transmission fluid/filter service"? on 2004 Jeep Grand Cherokee

I have 120,000 miles on my vehicle and change the engine oil/filter at 3,000 mi and do a transmission svc each 30,000 miles; but, I have never changed the front or rear differential fluid or the transfer case fluid. So, my question, is the service I need to perform 1. Differential fluid repalcement front and rear? 2. Transfer Case fluid replacement? Thank you

Asked by for the 2004 Jeep Grand Cherokee
2 answers
You need to service your front and rear differentials every 30,000 miles as well and the TC. If you have a select trac TC you will need just full synthetic 75w 140 gear oil for the front and rear diff. If you have a quadra trac or quadra drive you will need to add 2 oz. of limited slip additive to the front and 4 oz. to the rear differential. Jeeps are very sensitive to which TC fluid they will take mine is a NV247 and specific mercon III. Ask your dealer but you can do it yourself if you can change oil.
i reccomend changing at 100,000. it runs 39.95 plus fluid for diff and the same for the transfer case.