Impala SS427.com Message Board
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Weird 12-bolt ratios
Posted by Dave Plummer
on 3/14/2018, 1:33 pm
In the parts book I see the normal 2.73 (TH), 3.07 (PG), and 3.31 (M20) ratios.
But I also see 2.29, 2.56, and 3.55
So far as I'm aware there weren't RPOs for alternate ratios in '69, so how would you wind up with one of those last three ratios?