There usually is one drain hole for each corner of the sunroof "cassette". A drain tube for each A-pillar and one for each C-pillar drain tube in the rear.
When I bought my '05 LeSabre Limited about 4 years ago, I put in the building and let it be. Then, a month later, I pulled it out to see what I'd bought. Other than the 10 year old Michelins, I openned the trunk to find a very damp trunk mat. And a spare tire well that was 1/2 full of clear water. I could tell that somebody had been jacking with the sunroof glass as it was not completely as it came from the factory, as to being flush with the sheet metal.
So I pulled the trunk mat out to sun-dry, bailed-out the spare tire well, and dried everything off. With the trunk mat out, further investigation revealed that the lh rr drain tube had never been installed into the plastic end that went into the lh rr wheelwell. Obviously, prior owner(s) had souight to have the sunroof glass adjusted to fix that, but they never followed the tubes to see where they went.
Plugged the tube into the end-elbow and all has been dry ever since.
At the front of the headliner, in the center, there should be a round plastic plug which can be removed. That is where the sunroof handle is inserted to manually open or close the sunroof. The sunroof emergency handle looks similar to a manual window handle, as I recall. It might be that the shaft of the handle indexes with a common-type socket. Like an Allen wrench hex or Torx bit? If so, they you might match that and combine it with a ratchet and extension to replicate the OEM sunroof handle.
You might check the Chrysler MasterTech videos at
www.mymopar.com for "sunroff service" videos. Probably from the 1975-'78 era?
As to "gears", I suspect the motor will turn two long/spiral "gears" on which the glass is attached to and moves when they turn. If they are "stripped", there should be some additional noises in the mechanism, I suspect. On the other hand, IF the motors have become weak and might need rebuilding, no additional noise.
Possibly American Sunroof (or what that company might have become in later years) might have some additional guidance as all that any OEM ever sold, outside of some gaskets and weatherstrips and glass units, was the entire mechanism. I highly suspect the headliner and all related trim will have to be removed in order to get to the cassette itself?
Hope this might help, in addition to Pete's comments above.
Just some thoughts and experiences,
CBODY67