On my 02 Jeep GC 4.7L HO? Tranny replaced and computer at about 160 K in 2015. So tranny fluid and function ok..Had her since 2011 at 90K. Only running her about maybe 300 miles per month now. Oil every 2500 miles roughly. But can't remember ever doing transfer case or diff. fluid.
Definitely way past due.
Hopefully you haven't been in deep water with it.
When you drain, if the oil has a tan milky consistency...water contamination...thoroughly flush and refill. If you get any debris bigger than wet powder, unit is failing.
If haven't done the oils ever you have mentioned I would change them for peice of mind & then look at service manual and find how often after that when they need to be changed. Best of luck
The change interval on gear-related oils is EVERY 50,000 miles. You're way over and I would do everything except a full flush on the transmission. At this point the transmission fluid has worn in the transmission and it might cause problems. Do everything else ASAP.
I have a 10 Jeep Jk, did my first manual trans, transfer case and diffs at 40K. Way over due for a Jeep. But I agree leave the auto fluid alone.
