check the upper and lower trail end bushings
Rear upper & lower control arm bushings need to be replaced.
There is something wrong with the tach. Take it to the shop. <--- wow, that is insightful!!
The curb weight for the Nissan Pathfinder varies according to the year. For example, the 2013 model weighed 4185 pounds, while the 2014 had a curb weight of 4149 pounds.
This is a well-known problem with this generation Pathfinders... the rear upper and lower control arm bushings are worn. Have them replaced and the sway should disappear.
I bought a pathfinder a while back and they told me it meant Sports Edition.
Maybe its your motor mounts.
Yes, either can cause a shake while driving.
Nope.
Wheel balance may be off...
Hope this link helps: http://www.trustmymechanic.com/auto-repair/22/1994-nissan-altima-engine-dies-while-driving-but-restarts-ok.html
You need to get your control arms/bushings replaced. It sways at speeds on or above 60mph. I just had it done to my 97 pathfinder. It is a problem that they have. boo :(