The '66 Olds 442 used the 8.2 BOP (64-66) 8.2 10 bolt ring & pinion.
One can buy the following new Richmond gear series from Summit (243.95+ ship) or California Gear:
-3.55
-3.90
-4.10
-4.56 (maybe still avail)
Select used (or impossible to find nos) gears to fit same low ratio 8.2 10 bolt carrier are avail in following ratios:
-3.36
-4.33
The 3.42 gear ratio was not used with '64-66 BO or 64-69 Pontiac 8.2 ten bolt, but was a '68-70 Buick 8.2 10 bolt...will not fit anything but 68-70 Buick 8.2 hsgs.
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Buzzards gotta eat... same as worms.
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