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A pan drop fluid change often costs around 49 to 69 dollars US, and as stated only changes about half the fluid. A trans flush will change it all, at an increased cost of 89 to 149 dollars US. Trans flushes are accomplished by tapping into the transmission cooler lines (often just unhooking one and putting the flush machine into the "cycle" of the transmission cooler system) and removes old fluid while adding new fluid. Certain vehicles that do require "special" synthetic transmission fluids may cost more to do the flush, but all in all, it is a worthwhile thing to do to help keep a transmission operating for a good long time.
Having said all that, if your fluid is a solid brown as opposed to a transparent pinkish brown, then you may be beyond where a fluid change will really help you out. Good luck.
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