Why does my truck buck only in over drive

So the last trans and this trans my truck has bucked only when its in overdrive. The trans i have now is brank spankin new and still does it. i changed The bad knock sensor and a few other odd parts. Any other idea what it could be that causes this?

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Sounds like a clogged catalic converter. Did you change the plenum plate?

Pull the upstream O2 sensor out, secure it. Drive around a bit and see if it improved.

If this fixes it you know what it is. Removing the sensor will make it sound like you have a muffler leak, so don't be concerned about that.

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