I changed my rear differential oil today, I ended up using Mobil 1 75w90. I drained a little under 3 quarts and put in about 3.5 quarts before it started flowing back out of the fill hole. The manual states that the capacity is 3.1 quarts so I hope I didn't over fill. The oil I drained looked really clean for 60K miles but I did notice a few small pieces of metal on the drain plug magnet, hope nothing funny is going on in there.
Just like engine oil changes the rear differential oil change was easy on the Tacoma. The step by step instructions with pictures you guys have posted have been a great help. I also changed my plugs a couple of weeks ago. This forum and it's great members has given me the confidence to do these maintenance tasks and has saved me a decent amount of money. Thanks again guys.