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Old 11-07-2009, 12:34 PM
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Mooch Mooch is offline
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Join Date: Jul 2009
Location: Tampa, FL
Cobra Make, Engine: ERA 427 - #783
Posts: 173
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I was having the same decision making trouble and made some rpm calculations for the ERA 3.54 and 3.31 rear ends. See pages 2 and 3 of this thread:

ERA #783 - with questions

I've decided to go with the 3.31 rear and the 0.82 5th for the better shift and balance, and I'll deal with the higher rpms and noise at higher speeds - which can be frequent on Florida freeways.

I'll let you know how it turns out.
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