Differential fluid on 2002 GMC Yukon XL Denali

How many bottles are needed for this vehicle for differential fluid, what does each bottle cost, and what is the labor time applicable to charge for this service?

This service can be found in the RepairPrice Estimator, with a breakdown of the parts and labor costs:
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My 2005 GMC Yukon XL Denali just set me back $163 for 1.5 hrs labor ($80.00) and 3 qts of 75W140 ($96.00).