How can you tell if the diff fluid is low?

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You need to open up each dif to check. The fluid should cover the cross pins at a minimum. Fluid weights are custom, but 200k in the center is a great start. 80k up front and 50k or 60k in the rear will give you decent results. Stock on the Notorious/Outcast is 10/100/10.
 
Ok awesome thx also when I took my truck outta the box the back sags is this normal and just needs adjustments or something abnormal and needs to be looked at and it was a little oily on the under side but I don't see anything leaking anywhere sorry for all the questions lol I'm fairly new to this bear with me lol
 
Spin one wheel. Does the opposite wheel spin the same way, or opposite? How much resistance is there?

If the diffs have oils, there should be resistance to them turning opposite. Thicker oil = more resistance.
 
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