Quote:
Originally Posted by Skyman 08
I don't legally see how they could, changing the rear gearing that much without changing anything else will effect gas mileage. Seems to me they would have to rate it differently... I know most cars will rate the automatic different than the manual, so why wouldn't they have to on rear gearing?
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I worked with the epa and NHTSA on a certain project, and while it wasn't the focus of what we were doing it did invollve fuel economy and as such I can tell you from my own experience that the EPA does not require re-cert. for optional axle ratios. You certify with whatever the standard ratio is and that's it.