If you remove this buildup, you leave gaps in the soft parts (clutch material) which means less material for the transmission to work with. The theory is, over time, buildup occurs within the transmission when flushes do not occur at regular maintenance intervals. I believe the problem which is actually being discussed is doing a transmission flush when it has never been done before (or with long periods without). empirical data on this, so please understand that caveat. So I'm fine with doing some minor maintenance to keep it going for a couple more years, but don't want to do anything that will possibly harm the transmission or make the problem worse. If I have to do a major repair at this point, I'd pretty much declare the vehicle "junk" instead. If I understand correctly, such treatments are usually best followed by a fluid change. I've had a little hesitation in shifting: I talked to my mechanic and he likely said it's a sticky solenoid, and he suggested a cleaning transmission treatment (such as Seafoam), but he hasn't looked at it. With my vehicle in particular (2000 Chevrolet Venture), I had a transmission repair and fluid change at 130,000 miles, and am now at 190,000 miles (so it is a little overdue for transmission maintenance). Is there any truth to this? Best answers I could find searching the internet were pretty inconclusive at best, such as yahoo answers with unhelpful answers like "if it ain't broke, don't fix it." The usual story is something along the lines of "older American make care with 200,000 miles, a week after we changed the fluid, the transmission went out." I have had people give me anecdotal stories (friend of a friend type thing) about changing the transmission fluid in vehicles with 150,000+ miles, especially those that haven't had regular transmission maintenance.
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