I am interested in how often i should change my tranny and diff fluids. I drive hard and track often. I also have 4.11 gears..
What fluid recommended for tranny and what fluid for diff? many thanks

 

Since these are expensive parts and the fluids are cheap (relatively speaking), I would be inclined to change at the end of each seaon if I were in your shoes. I would go with either Amsoil or Redline fluids in both the tranny and the rear. Since the rear holds less than 2 quarts, it would only be about $16 for the yearly change.