Regarding fluid swaps, remember the TOD transfer case has it's own fluid reservoir that should be changed also, ATF as I recall. ("Transfer case" is the mechanism that splits the power and sends it to the front wheels as well as the rear, for 4WD).
Also suggest changing the gear oil in the front and rear differentials for synthetic. (Note: the rear differential is a limited-slip unit that may need anti-chatter additive to the fluid. Some synthetic fluids say the additive is not needed...you can always try it and add the additive if the rear diff "chatters" at times).
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