Rear Drive train problem

[Hudson5150]

Attached to the rear diff on the diff side of the Xmod is the piece that holds the dogbone. I have drawn a cheesy picture to describe this in better detailed (see attachment).

I have gone through 2 of these in the past few weeks. They keep expanding on me widening the gap the dog bone sits in.

Each time it breaks I have to buy a new AWD kit for this little part I need. It would be nice if there were aluminum or steel pieces I could use to replace it.

I have been using the 9 tooth pinion. Maybe there was too much torque for this cheap plastic part? I am going to switch to the 10 tooth and see if this helps but I fear the worst still.

Has anyone else had this problem? Any ideas how I can prevent it from happening again? Thanks for reading.