I am confused. My driver's door label says I have a CA40 rear axle on my '08 2wd frontier. Is this the same thing as the 200 axle mentioned in other postings here on this blog? If it is the same, then I understand there is no air locker available to purchase for this axle. Is that correct? Just curious. Thanks for any help in clearing this up. Sorry if I missed this on earlier postings.