Do you have any suggestions?. My only symptom was slow cranking, then when it started it was shaking the whole truck, heard a grinding noise then it shut off. I tried cranking it via the single wire to battery with key off. Starter just spun, wouldn't engage . I removed it and that's what I saw.
Seeing as you have the starter out I would inspect and test it to make sure nothing is funky with the bendix etc.
Then bare the engine over one tooth at a time and look for any thing that may be able to do that kind of milling on the inside of the case.
Can you move the flexplate/ring gear excessively fore & aft or up and down
with a bar?
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