Transmission
when your fluid starts to turn dark and you'll smell the fluid,you will know if it's burnt,this happens when the bands gets loose and out of adjustment,as your coming to a stop with your foot off the accelerator pedal and the vehicle starts to slow down the band will help the transmission to slow as well as the vehicle,but if the bands are loose and not tight enough,your clutch's will try to slow the vehicle,when this happens the clutch's will not hold and start to slip,and this will burn the clutch's as well as the fluid,after this keeps happening the clutch's will start to slip when you start to take off from a stop,and will burn the clutch's even more,now your in need of a transmission rebuilt,so when you notice the fluid starting to smell and turn from red to dark red or black,the best thing to do is take it to a transmission shop and have the fluid and filter replaced,and have them adjust the bands,if you try this at home the fluid change should not be a problem but the band adjustment is a different story,if you don't follow step by step and tighten the band's too tight you can break the band's and that will make a for sure thing that you will need a rebuild,so just because the fluid gets burnt doesn't mean you need a rebuild unless you have driven it to long.