I have 50k miles on my truck now. I had the transmission fluid and filter replaced once so far and the bands (whatever they are) adjusted. I refuse to let the dealer near my truck so I am gonna do it myself. How often does this need to be done and what is this business of adjusting bands? DO I have to do this every time I replace the filter and fluid? Should I refill the transmission (its an auto) with the MOPAR fluid again? I have never replaced the fluid in the axles yet (4X4). I assume any 80W90 gear oil is sufficient or should I get the MOPAR stuff for this?