ring gear slipping off

[Willynch]

I have a 30 Tudor. Ring gear keeps slipping forward to the point that starter cant engage.

I remove starter, tap ring gear back into place but eventually happens again.

I tried using LockTite to see if it would hold the gear in place but that does not work.

Im assuming i need to do something more invasive to solve the problem?

Would appreciate guidance/suggestions

Thanks