Here is the All Data Break Down on Labor. If you look it is 4.6 plus another hour for the Ring and Pinion. That does not include additional bearings that might be needed.
Labor InformationSkill LevelMfg. WarrantyStandardDifferential Case
Replace
With Limited Slip
B3.34.6NOTE
To R&R Ring & Pinion, Add
B0.01.0To R&R Side Bearings, Add
B0.02.2To R&R Pinion Cups, Add
B0.00.2To R&R Axle Bearings, Add
B0.00.2To R&R Gear Kit And/Or Clutch Pack, Add
With Locking
B0.02.5Without Limited Slip
B2.93.2NOTE
To R&R Ring & Pinion, Add
B0.01.0To R&R Side Bearings, Add
B0.00.4To R&R Gear Kit And/Or Clutch Pack, Add
B0.00.2To R&R Pinion Cups, Add
B0.00.2To R&R Axle Bearings, Add
B0.00.2