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to check the fluids in your differentials and or transfer case, you'll need to get under your truck. On level ground chock the wheels, you'll need a 3/8 ratchet. normally on the left side of your transfer case you will see a fill plug (not the one on the bottom) remove the plug and fluid should be even with the hole opening. if not use SAE 50 lubricant to top off.
The front and rear differential is also the same idea..checking to see if the fluid level is even with the fill plug. use SAE 80 or 90 to top off.
while under your truck grab the driveshaft near the ujoints and see if you can shake them...should be no play at all (up and down or side to side)
Good Luck
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