Transmission is a gear box that turns engine rpm into tire rpm.
Main component in your 4wd system. It is the gearbox that makes your front tires move with your back tires
A front differential is the gearbox that drives your front tires
A rear differential is the gearbox that drives your rear tires
The driveline connects the transmission or transfer case to the differential.
Burnt Fluid or Burned fluid
Transmission fluid new out of the bottle is a clear fluid and, more often than not, red in color. Burnt or burned fluid is usually very dark brown or black and has lost its transparency. Often times it will have a very poor odor.