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Message: <blockquote data-quote="Bill Ellis" data-source="post: 682090" data-attributes="member: 59929"><p>You will hear convincing arguments on both sides of this debate. However, the notion that a full flush stresses the trans is nonsense. During a flush, the transmission's internal pump transfers the fluid so it really doesn't know that anything different is happening. It just pumps away like usual. A full flush is the only way to change all the fluid. A pan-drop only changes about 25% or so. It is true, however, that a full flush of a high mileage tranny that has never had any service can cause problems because the detergency of the new fluid can dislodge a lot of normally harmless gunk that has built up over the years which when circulated through the system starts to clog things and then tranny dies.</p></blockquote><p></p>