2.66 low gear vs close ratio

I've been following this thread because I've wondered what gear set I had in my transmission, and I had a couple of questions.

- If the trans is already in the car and driving, is there away to find out what gear ratios you have without pulling it out and opening it up?

- Were there any A-body trans built '70 and later (newer) that had the 2.47 gear set? From the factory, what would have the intended of a vehicle that had a 2.47 gear set?

I'm barely getting my Duster together but been driving it on the weekends. I haven't opened up the diff to verify my rear gear, but the tag says 3.21:1.

So far, the transmission seems to shift good and the RPM's are right (i.e. pulls good in the appropriate gear even at a slow cruise). 1st gear isn't very short at all, and neither is 2nd gear.

I guess that's why I wonder what I have in there. I did have the transmission rebuilt, but forgot to ask what ratios I had. The car previously had a 3 speed (A230).