[nitebeest]

It's better with 4 b/c then your car is totally level. If you just do the front 2 your going to be at a bit of an angle causing some of the fluid to not drain out properly. I just did my tranny fluid though with only the front 2 jacked. I did it on a driveway though so it was about level anyways. But either way you get most of the fluid out so there's not to much to worry about. And don't forget to run to the dealership and pick up 2 new crush washers too for the bolts. You're going to be there anyways getting the tranny fluid. I don't get why they only have you do this every 90k miles. It's so easy to do. Almost easier than an oil change becuase you don't have to wrench out a filter as well. Maybe I'll start doing this with every other oil change... smooth shifting all the time...