Just my opinion but I think these cars are heavy and need a lot of gear to get em going. If a set of 4.30s were available for the same cost as a set of the 3.91s I wouldn't hesitate to put them in.
For the average person that doesn't see a lot of drag strip time 3.91s are a good balance of price vs performance.
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2013 model 2SS LS3
1969 model wife. Factory stock, no mods. Redhead package.
2005 model son. Special ordered with the hell on wheels package.
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