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Originally Posted by Lt_Dusty
I have been told, if your transmission has not received regular service through its lifetime, a flush could possibly loosen deposits that are better off left alone. I would agree with that. application.
Dusty
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I agree with this statement. Here is where the problem or the catch is. If you do regular flushes, you will never have a oil breakdown related problem with your tranny, it will be clean, never accumulate enough debris to destroy anything. If your hard parts don't fail (eg sun reaction shell), you'll get many many miles from it. If you don't do regular flushes and one day you decide to do one, you could ruin the tranny because of the above mentioned post. If you have ever been inside a 4L60e you will understand where you will have your problems(eg valve body oil passage screens, two of them, shift solonoid screens, EPC screen) these screens can become clogged with clutch material, metal material, dislodgd from the new oil. If these restrictions become signifigant enough, you lose proper oil pressure signal and begin to destroy, or burn up your transmission. If you don't change your fluid and continue to drive with worn fluid(transmission has MANY friction modifiers, additives, that protect and make your transmission operate properly) your fluid will eventually wear out, further accelerating wear on transmission parts, and your in for a rebuild. Changing just the pan oil helps inject some new oil and more importantly some fresh additives and friction modifiers, which helps. The good part of this is that a new filter is being installed, and will help collect all that material. Another area of concern, and its usually overlooked is the tranny oil cooler, especially the aftermarket installed ones. These coolers are great for reducing transmission operating temperatures, but they too can become clogged very easly as a result of transmission material floated through with the tranny oil. The material clogs the passages within the cooler restricts line pressure back to the tranny and eventually burning up your trans. Even a partial clog will eventually burn up your tranny too. When you flush your tranny, or do oil and filter changes, its also a very good idea to flush out your tranny oil cooler. Transmission parts places have a cleaner especially just for that, maybe some good parts places too can get it for you. Either way if you do regular flushes, you will be way better off, and most likely not have any problems.