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Regarding having 33% OD with stock 3.78 rear end: most folks seem to agree that is too tall for most cars unless you have a souped up engine. I have a heavier Town Sedan, with a 5.5 head and stock gearing. The standard Mitchell 26% seems about perfect.....I can still pull modest hills in OD, and 55 is my most common cruising speed, which is just fine with that setup.