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Originally Posted by Z71_Texan
My old Z71 had a locking differential that required frequent fluid changes and also an additive.
My 2005 Z71 owners manual does not mention frequent fluid changes or the additive.
Has Chevy improved them so now none of that is required?
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Z71, can you define if you have the locking differential - or the limited slip differential? They are different. Mine (not a Z71) has the locking differential in my 2004 - and frequent changes are not required.