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Anybody know the fluid capacity of the GMC 25000HD Locking Differental. Don't want to buy to much of that stuff when I change it.
 

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1 Gal. is what it took on My 3500, diff's are the same I'm told
 

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Yep! Just under 4 Qt. use full Synthic gear lube. 75/90 or the heavier stuff if pulling heavy loads.


Do a search, lots of good info on here about this.
 
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