hey guys need to replace fluids in 231 hd transfer case not sure what to use dextron or atf4,?? also rear diff, its should be 9.25 corperate ,not sure if this is limited slip? thanks for help.... 98 dodge durango 5.2

 

atf4.
lift rear tires off ground, spin tire, if other side spins same direction it has lsd, if not you dont.

 

atf+4 for the t-case

check the rear differential as described above, do this with the front tires blocked and the trans in neutral. if you have an lsd make sure to put the friction modifier in it