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Hey guys - new to the forum, new Tundra owner as well (2015 Crewmax 5.7 Ltd, stock) I've spent several hours searching this forum and others for a clue to my (presumably) transmission clunk mystery. This thread seems to be the closest in terms of symptoms, but it's super old and there isn't much closure.

When I'm driving at a constant speed always in the 40-55 MPH range and the truck is in a high gear, 1200-1400 RPM, if the road is slightly inclined I often feel a very noticeable clunk. Like going over a small pothole. It will sometimes do it just once, other times a few in a row spaced out by a couple seconds - not a shutter though. The RPMs don't change, so it isn't a hard shift, and if the truck downshifts to higher RPMs it won't do it any more. Similarly, it won't do it at freeway speeds. I've put about 2000 miles on the truck since purchasing it and the issues hasn't gotten worse. Took it to an independent Toyota shop, they said no relevant codes, flashed the latest SW version, and they saw nothing suspect when it was up on the lift. Otherwise the truck drives perfectly fine.

Not sure if it's poor form to dig up an old thread, but just hoping anyone here may have found some answers in the past few years. Wondering if maybe a transmission flush could do the trick, or maybe just accept that it's a truck and will drive like one?

Thanks in advance!
Did you ever find a solution? I am experiencing the same issues.
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