I just changed mine last weekend, at around 87K miles. I found some good tips on this site and the 355nation one, but to try to sum up what I did:
- Bought 6 quarts Dexron VI at Walmart (they only had 6 in stock, and the auto parts stores near me didn't have any!)
- Bought replacement filter & gasket at Autozone, $16.99
- Drive truck up onto ramps ($43.99 at Walmart, so worth it!)
- Hold replacement gasket up to pan to ensure correct size/shape prior to unbolting pan
- Remove all bolts (think they were 13mm), had to remove a heat sheld (2 bolts, also 13mm) on passenger side of transmission for better clearance
- Have an assistant hold pan up while I bent the #@$% shift linkage a half inch or so out of the way, towards the driver's side
- Lower pan into whatever sort of tray you're using to catch the fluid that by now has probably thoroughly soaked into your arms, hair, and the ground all around you, and dump it into your drain/catch pan
- On mine the old gasket peeled right off
- Pull down on filter (stuck in bottom of transmission), watch out for more transmission fluid splashing out of it
- There's a metal and rubber O-ring that seals the filter in-place, the replacement kit comes with one, but da#$ed if I could remove the old one, even with all manner of pulling tools. I searched the forums and it sounded like most people just left the old one in there. I saw a post from one guy who said he was able to remove his with a slide-hammer (!!!), and a few others who mentioned that they hammered a screwdriver up into the side of it, bent it inwards on itself, then were able to grab it with pliers. I left mine in.
- After cleaning the pan of all debris line the new gasket up onto it, and hold it in-place by pushing all the bolts through (holes in gasket will hold tight onto the bolts)
- Bolt pan back into place, reattach heat shield, and bend shift linkage back into place
- Add 5 quarts Dexron VI, test drive, and check fluid level. Mine was perfect with just approximately 5 quarts
I've heard some people say you should do this every 30,000 miles, other people say 60k or even 100k (I think the manual says 100k), I did mine at 87K-ish and the fluid still looked good, but wanted to get it done before the winter months hit us.
Good luck with yours!! :)