I just dropped off my T4R for the accelerator pedal recall and asked what it would cost to change the differential fluid. I was quoted $189 EACH for front and rear ! Are the nuts? almost $400 to change front & rear differential fluid, their defense was that they don't just drain the fluid they use a machine to flush it. Obviously I turned them down. Has anyone had their diffentials changed at a Toyota Dealership and what did they charge you?