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Message: <blockquote data-quote="Richard L" data-source="post: 983404" data-attributes="member: 52972">Bill,That is total BS.  I would be willing to bet that the shop does not even have a flush machine!   A flush machine uses the transmissions pump to pump the old fluid out and lets the transmission's pump pressure push new transmission fluid back into the transmission just like the transmission normally does.  It cannot damage the filter any more than driving down the road can.  Nothing is different than just driving down the road...The transmission flush machine is just two reservoirs separated by a piston.  The pressure of the old fluid getting pumped out of the transmission into one reservoir is used to push the piston which moves the exact same amount of fresh fluid back into the transmission.  No pressure difference, no back flushing (which is a total myth) and no need for any cleaners or solvents.  It just replaces about 99% of the old fluid with fresh fluid, which is about twice the fluid changed when you drop the pan.Shops that try to scare people from having their tranmissions flushed don't have a transmission flush machine (expensive single function device)   Like I said before, you are at least 5 times more likely to have problems letting a shop do the conventional drop-the-pan fluid change then getting a transmission flush which just connects to the transmission cooling lines...100% guaranteed not to cause a transmission pan leak....Rich</blockquote>

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