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I have found the passenger seat lacking in that the front edge is too low letting peopole or items slide off and lumbar support is nil. I guess Nissan was more interested in the utility of the seat back folding forward flat and forgot the primary purpose of the seat.

My fixes:

To raise the front edge, purchase a supply of large fender washers and longer bolts. Remove the front bolts and almost remove the back ones. Stack up enough fender washers in the front to reach a comfortable hight. The front bolt angles are difficult so I hack-sawed the last few into "U"s so I can could slide them in after the bolts were started. I raised my front seat about and inch and a half. A little more might be better.

To add lumber support, remove the plastic tray on the seat back. It is held into place by two plastic snaps on each side at the bottom. Pull straight up and it will release. At the top it simply slides into two notches. The fabric in back is cleverly clipped together and separates easily. Two horizontal springs will then be exposed. Your goal is to insert some sort of padding between the springs and the foam. I started with an airline pillow (yep, stole it) but it added too much. For now I have settled for a neatly folded bath towel. Ideally, high density foam would probably work best. Since it so easy to access the lumbar area you can experiment until you get it just right.

Going to 1200 miles this weekend, so I'll know then how it all works.
 

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I would like to mod the front but have been a little worried as to the safety of simply adding washers. You've increased the moment load the seat exherts on the floor by a considerable amount. It might not matter though since the seatbelts should be taking most of the load severe load. There might be some long term fatigue around the nut to worry about though from passengers pushing themselves back in the seat etc.(like when you bend a wire enough times it breakes)...just thinking of the worse case scenarios. I wonder how hard it would be to retrofit the Infiniti seat controls. They have the 8 way passenger seat on the QX56.
 

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Agree with your diagnosis of poor seat quality.

I inserted a 1/4" - 3/8" piece of aluminum between the seat and the floor - retained the original bolt. This setup does not concern me with regard to safety. I would be cautious about using other longer bolts and washers. A stack of washers does not provide any lateral support to the bolt and make sure you are getting a grade 8 type bolt to avoid having it shear during a crash.

Not sure I'm ready to dig into the seat padding just yet. We throw a lumbar support pillow in the cab during long trips.

Seats are about average for a truck - but way below what I've become accustomed to in my Volvo.
 
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