Quote:
Originally Posted by syr74
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.
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What if you were to change the tranny gearing? Do you know if that would require EPA re-cert?