I have bought an 03 F150 FX4 with automated transmission and about 185,000 miles. No troubles so significantly with the transmission but truly feel like I need to have to alter the fluid along with filter and new gasket. I have been explained to a total flush is greater. I have also been explained to that a total flush in an more mature tranny could lead to problems??? What do you imagine? I know this truck had to preceding flushes at about 75,000 and once more at all over 125,000? Views?