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It’s 2WD so no transfer case.What about other driveline components? Is it possible there is wear and/or a problem in the transfer case, joints etc that is causing the clunk/shudder you are feeling? Or does it definitely feel like a trans issue?
Long story short, I've got trans I've had replaced unnecessarily because it would often clunk when slowing down, right at 25mph, when it shifted into 3rd. I'm now convinced it's due to a sudden release in tension when the torque converter unlocks that then echos through something else in the driveline that has some slop
I did actually add both LubeGard ATF protectant and LubeGard Dr. Tranny.If the trans is likely shot, you could see if adding one of those anti slip additives does anything. I think all they do is thicken the fluid up. Could buy your some more time for cheap. I thought Lucas made some