“Rear Cradle Subframe Crossmember K Frame”. seems like a big job for a DIY’er. Has anyone done this job themselves? If you’re thinking about it, I hope this video helps you with the repair.
With the right tools it’s possible, a lift is almost a requirement unless you like laying on your back for a day or two. I’m sure that heat (hand torch) will be needed to get some of the rusted bolts out, so caution will have to be observed due to the fuel tank being right there.
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NHTSA is not going to do anything over a 13 year-old car. Nissan will just chalk it up to improper vehicle maintenance or some other nonsense. For example, see the language below from the owners manual that they’d inevitably use to wash their hands because they didn’t build the cars with sufficient corrosion resistance for those that live in the rust belt.
UNDERBODY
In areas where road salt is used in winter, the underbody must be cleaned regularly. This will prevent dirt and salt from building up and causing underbody and suspension corrosion. Before the winter period and again in the spring, the underseal must be checked and, if necessary, re-treated.
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For weight purposes, without a lift or heavy equipment, the rest should come off first…
The driveshaft and rear diff can be left alone, your correct.