If you had read you would see that he was talking about changing fluid with 119k miles on it and my post said that I do mine every 50k so the problems you list would not be there. The filter change at the first service will have finite metal pieces in it from the internal metal parts starting to round off the sharp edges and that metal gets trapped in the filter like it should. You have your opinion, even if you give it without reading everything, but mine is based off of real world experience being in the business for 35 years. you are always welcome to yours and I am to mine. Believe that, because yes you did just read that.
wow...thanks...mine is also based on real world experience and the same amount of time in the field....a good portion of it as an engine, transmission and rear axle specialist...the finite metal particles (from " the internal metal parts starting to round off the sharp edges") as you stated are of no real consequence and are generally from the initial break in of the transmission (even by your description) which occurred many miles previous and have no harmful effects or we would require an early filter replacement in order to eliminate them...in the event there is significant enough wear in the transmission to compromise the filter then there is damage already done that no servicing could reduce (which is what you would have pulled from my information had you read it)...the filter is there to capture particles from normal wear and for all practical purposes will most likely last the life of the transmission without requiring replacement under normal circumstances (read-routine maintenance)...
it really is inconsequential how many miles he has gone as long as he has not experienced any abnormal wear or damage to the transmission....a transmission flush will not "shock" the transmission into failure along with the fact that a fluid and filter change would be (as previously stated) more intrusive than simply replacing fluid as it passes along its already mundane route to and from the cooler as a flush does....
both services introduce new detergents that will continue to clean the transmission....the transmission is not "familiar' with the fluid that is already in the transmission and adding entirely fresh fluid as opposed to only partial fresh fluid will increase the lubrication properties and more likely stave off additional wear as opposed to causing more...
again....if there is enough varnish build-up in transmission to cause a problem the damage is already done...if the fluid being changed does not indicate any concerns there are none to be concerned about...under normal service transmission fluid will last well over 100k miles and some manufacturers are not recommending changes at all or at intervals in the 130k area because of this....it is not 1985 anymore....I think my post was clear regarding the conditions where a flush is more beneficial than a fluid and filter change....
the firestone dealer who turned down the flush citing potential damage has probably made the mistake of changing fluid on vehicles with problems/without checking the fluid pre-service and found out the hard way that those should be avoided....many customers think that a service is a fix all and walk unwary/naive service departments into that trap unknowingly....
I don't have a reading deficit....I saw an inaccurate description of what a transmission flush does and the damage it can cause and called it out...if you need credentials they are a college education in automotive service...17 years as a gm master certified tech....17 years as a dealer service manager with zone and division leading customer satisfaction and repair success rate....ase master certification and currently a technical school automotive technology instructor...I wouldn't normally mention it but am pretty sure this is the beginning of a dick measuring contest that I am not going to participate in beyond this point...the op has enough information to draw their own conclusion...
have a great day....
