What is the toyota tacoma rear differential fluid capacity?

The Toyota Tacoma rear differential holdS4.2 quarts of oil and Toyota recommends using 75W90 gear oil when You need to change it. The thicker oil provides better protection for the gears in Your differential because it is small and can get very hot. A thinner oil may break down easier and lead to less lubrication performance. In general I recommend to check Your differential fluid every 6 months to make sure that it is full and free from debris. Any debris will be a sign that there is a problem inside the differential with the gears. You will want to drain and inspect the gears if You happen to notice any problems.