Ihave a 97 Rl with 134,000 miles on it. I am recently experiencing a vibartion/woobling that starts after i drive the car for about 30-40 minutes. The vibration used to be mild and start around 42 miles/hr, but it can be felt at any speed once it started. The vibration get worse as I drive more miles,I work on japanese cars for a living but specialize in nissan, I have checked everything and replaced both axels, as long as there is a load on it its severe, decel and accel it literally feels like one of the wheels is going to come off, also has different wheels and new tires,same with old ones iam suspecting differential, I cant be the only one with this problem, its nothing obvious like wheel bearings are struts are rack

 

any chance you could put a different set of tires on it? i have seen tires with broken cords deform after they get hot.

just a idea.

i hate problems like this because you have to try something then go drive for 30-40 min to see if you did any good.

 

I have brandnew tires on it and rims

 

????NEW RIMS?are they aftermarket??

if so you may need to check to see if they are Hub sentric?

meaning is the very center circle of the rim the same size as the hub center?if not the rim can shift and no longer remain centered...

and heat over time can cause this rim to move.

 

Factory rims and brandnew tires, I have taken the diff out and dont see anything obvious, will dig in further and check lateral play.