Thanks Johnta1 for the '70/'71 rear end ratio charts. I tend to believe these more than others I've seen/used, as well as the many cars ('70-'73 Firebirds) we've inspected over the past 50 (!!!) years do confirm their accuracy...not that some anomalies didn't happen from time to time.
Ramairnacho, available new 12-bolt ring & pinion gears now come 3.08, 3.42, 3.73, (3.90?), 4.10, etc. I don't think anyone makes 3.07 & 3.55 any longer...I could be wrong. So that is what you probably saw was a new 3.08 R&P in the car, or just a simple error. I wouldn't sweat finding a correct 3.31 open 12-bolt rear, unless you were building a concours car to go to the TA Nationals, MCACN, or Pebble Beach for 1000 point judging. I would use the 12-bolt you have if it is in good condition as no one will be the wiser since it's very hard to see. If yo find one, great, but it will take a while and be costly...jmho.
Dennis
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