904 / New Converter, abnormal noise

360duster said
removed the trans today, no signs of abnormal wear on the converter hub. But i found sth. strange at the reaction shaft, the Splines are somewhat "gone".....any clue what can cause this?

I did not notice this before instalallation of the new converter. Is the shaft still ok, or should i replace it?

View attachment 1715318513 View attachment 1715318514

Uh oh, I think you found your noise, and why you were hearing a spin down sound.
This is a lockup but the reaction shaft splines should look like this.
Your's have been shaved down.

Pic 1.JPG