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If the starter is grinding and the new one does the same thing, you need to check the flex plate. That is the geared component which the starter engages with. It is possible that the teeth on the flex plate (flywheel) are damaged.
I found two pictures. The first one shows where there is an inspection plate on the transmission. It is used for both inspection and an access point to unbolt the torque converter. The second pic shows one of the bolts on the torque converter. Where I highlighted is where the teeth will be on the flex plate. You will need to rotate the crankshaft clockwise a little at a time to see the entire way around the part.
Other than this, you can remove the starter and look where in where it mounts to see the flex plate.
Let me know what you find or if you have other questions.
Images (Click to enlarge)
Sunday, August 25th, 2019 AT 9:08 PM