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Originally Posted by sanyamo
An old mechanic told me to not flush the transmission and as absurd as it may sound he thought I should replace the filter but save the old fluid and re-use it...something about transmissions going bad after replacing/flushing the fluid. 
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I can kinda see where he's coming from. As our clutches wear down, the friction materials wear off the clutches and begin to free-ride through the tranny via the fluid. As your tranny gets older, there can be a lot of clutch floating through your fluid. The friction material floating around actually helps the older/more worn clutches to grip better.
But yeah, always change your fluid. If some of your clutches are getting old, replace them.
