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Message: <blockquote data-quote="Jrgunn5150" data-source="post: 666465" data-attributes="member: 9682">Ugh, i hate these threads, because descriptions on the internet are so hard to nail.It's probably fine, the grinding is weird though. Does it do that when you shift into reverse?Anyhow, as far as flushing transmissions goes... The problem is, people don't chenge their fluid the way they should... So, they run 100k plus miles, the transmission starts to act weird, then they decide "oh gee, something is wrong, maybe I'll flush the thing"... Which they should have done 80k miles ago... Then the transmission goes out like it already was anyway, and they blame it on the fluid flush.The first transmission I ever built (4r100) is in a F350 and has over 220k on it since the rebuild, still going strong, in a tow truck that get's the fluid changed every 30k miles whether it likes it or not.Once a problem becomes evident however, flushing is almost never going to help, and almost always just wastes money.</blockquote>