Differential Oil Capacity

Preparing to change the differential 75W-90 oil in my 2007 Winn. I am finding conflicting amounts, 3 pints, 3 quarts, many gallons!!

What is the correct capacity so I buy the correct amount?

Thanks....

Year: 2007
Make: Winn
Model: Voyage 38J
Serial: 10F90H253787
VIN: 5B4MPA7G573422088