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GM started with the Direct Drive and later switched to the Gear Reduction as the whole industry did. Either will work.
You can tell by the size. The direct drive is 4-5" in diameter and the gear reduction is 3-4". It just looks smaller.
The direct drive is cheaper to rebuild. and the 24v...
From your description I would say you starter is on its way out.
You can take the starter apart to see if there are any issues with it. I would take it to a industrial starter/alternator shop for a test/rebuild.
The new gear reduction starters are another choice. Just make sure you have the...