I think there's 4 main bolts

 

Wait.... Aren't there nine bell housing bolts?

 

In donbrew's diagram, you should be able to access 5,6,7,8,9, and possibly either 3 or 4(the one right above the starter). With my manual, there are 3 empty holes on the bottom for 7,8,9, and there are bolts below 2 of them. You may be able to get to the others by removing wire and looms.

So on my manual, I can see, and get to, 4, maybe 5 bolts. There's definitely more than 4 bolts. Not sure if the bolt for the starter is one of them(kinda looks like #3), if so, maybe I could get to 6(of 8).

 

I'm saying mount bolts securing the transmission to the engine, there are other bolts



This shows nine holes in the flange, I'd have to crawl under the HHR to verify.

 

OK, yeah different than manual. Good pic!

 

I try! It wouldn't stay still, pesky perky transmissions.

 

That bolt to the right just above the hemisphere shape is right under the oil filter housing. With the radiator and fan in place I could barely even touch the bolt with my bare hand let alone attempt to tighten it with a ratchet. The intake manifold makes for a mighty tight fit for a ratchet and 18mm socket.... They are 18mm by the way. As for the others they look like they might. MIGHT be accessible with the air box off. I'll check it out tomorrow. I just hope the bottom four that were easily accessible were just loosened sometime in the past by someone who didn't know what they were doing. If they are all loose at least two would remain that way forever as far as I'm concerned as they are meant to be serviced with the assembly out of the care I'm guessing. Such an odd find. Gregg sure is unique lol