Q: Is a flush okay for an older transmission? Or should you stick with a drain and fill.

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My truck has 124K on it. I have heard both sides of the coin. A flush could loosen up deposits and cause you more issues, or complete failure, but it makes sense to flush it as well. As far as I know, the previous owner never changed the trans fluid. Can I go with a flush or just a drain and fill to be safe?

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