amc 401 flywheel ring gear question

[SHIFTY]

my ring gear and powermaster starter killed each other,the ring gear I had on it was 164 tooth and the powermaster has a 9 tooth gear,from all the research I did it should have worked out,
this is the one that ate my ring gear

https://www.jegs.com/i/Powermaster/7...RoCXwQQAvD_BwE

and this is the new one on the way

https://www.summitracing.com/parts/p...xoCi-IQAvD_BwE

havent ordered the new ring gear yet,trying to figure out if my ring gear was the problem.

no I did not use spacers,bellhousing is from a early cj,since im using an np435 4 speed,401 came out of a 1976 cheeroke cheif.