Welcome to the forum,
This forum is full of great looking trucks; packed with great mod ideas and there are loads of knowledgeable and experienced people here.
I take it you have done all the basics for checking fluid levels in the T-case, trans and diffs?
If you post your question in the 'Help Zone' ; '3rd Generation' ; 'Powertrain' , Here
, you will attract a more focused audience and likely get the info you need quicker.
(It's where a lot of the techs hang out
AND - We all like pix! Got any to share?
Enjoy the Z!