I know I have gone waaay overkill on mine..but I have been doing mine at 25k miles in both my Grand Voyager and my Dodge Dakota
The Voyager is ultra freeking easy, the pan is right there and just whip out the bolts and pow....the Dakota is a bit harder.
The reason I have been doing this is because I live in TX and it gets freeking HOOOOOT...so in order to keep from burning out a $2000-3000 tranny
Whats 30 bucks every 25k or 2000-3000 after you burn it up?
Normally just drop the pan, change the filter, refill with good fluid every 50K is good...dont bother with the flushes...they just muk stuff up
Brian
AwPhuch