I've never seen the ratio advertised anywhere on your car. I didn't figure mine out until I got the diff. cover off, the first time.
If you have the lowest compression/horse power version of the 400 that year, the harmonic dampener does not have the outer ring (usually) . You probably have the 2.41:1 gear that my car has in it. In my opinion Pontiac probably wasn't too proud to advertise that gear ratio, didn't really want the customer to know...
My car ran pretty well when it was newer... got great MPG, still does...
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1977 Black Trans Am 180 HP Auto, essentially base model T/A.
I'm the original owner, purchased May 7, 1977.
Shut it off
Shut it off
Buddy, I just shut your Prius down... 
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