Best not to flush. Have it drained and refilled with the correct Amsoil fluid.Is it too late to have my transmission fluid flushed and changed at 127,000 miles? My Jeep is whining when I accelerate. I bought it in 2017 at 90k miles and have not flushed trans fluids. I was afraid to at that high of mileage and now I am concerned. Thank you for your time and answers.