Well here's what happened in the past 6-8 months
Previous related problems
Starter is 6-8 months old, alternator new, battery (600 cold cranking) new, flywheel retoothed by Fidanza 3-5 months ago

Any ideas? I REALLY don't want to have to pull the trans to change a flywheel again, but two starters doing the same thing? Something's not right

Depends on the starter. I went through 3 "top quality" starters in my car within a week until I got one that worked properly.

I would not put a bad starter out of the question, but I would check your flywheel when you rip it out.

I plan on checking the flywheel. Hopefully Fidanza will replace the ring gear again if it's bad.

Broken teeth AGAIN! The starter tested fine. The guy at Auto Zone suggested that the teeth count on the ring gear is wrong. The data base suggests 135 count. I'm going to verify that at the GM dealer Monday and also call Fidanza and see if they could have possibly put the wrong gear (2200 maybe) on the flywheel to begin with and then replaced it with one that matched the wrong one. Am I the only one this has happened to?
I'll keep you guys informed.

damn dude, sorry you went through all this. go buy yourself an OEM reman starter from a GM parts dept at the dealer for $150. You get a one year warranty with it. GM dealers will give you a lifetime warranty on the starter if you let a GM dealership install it. I did it myself.

I have a similar story as yours. I replaced my starter last summer from O'reilly auto parts. The starter went bad in less than a week. I noticed the starter they gave me was not the same size as the OEM starter either. But it matched up in their system. I installed it anyway. It was a blessing the thing failed. When I took it off, the damn thing, scratched up my flywheel gear teeth. I'm lucky, it didn't break any teeth off. This is the 2nd car, I tried to go to the auto chains rebuilt starters and were burned.

I got a stock flywheel and am going to put this in there at least for the time being. I'll get a Spec later when I 100% decide on the power adder I'll be using.