I have never actually used a grease gun before. So, I'll start there. I looked through so many forums about how often I should grease the drive shaft, and I kept seeing either every oil change or every other oil change. I also kept seeing that if the 4Runner is used around mud, dirt and water off-roading that it's a good thing to just grease it again because grease is more susceptible to the elements than oil is in the sealed system.

If you have a differing opinion and at least some reference for me to read backing up your claim, I would be more than happy to look at it and possibly make corrections. I'm constantly updating this when I find out more or better information. I have one more thing to update that I know about which is the socket size needed to re-torque the 19 transmission valve body
assembly bolts, for example.
Thank you!