It was the rear, where the driveshaft attaches to the differential. However, a loose bolt in middle can also cause a vibration. You could also have a problem with the center bearing.

 

Thanks I'm gonna check it out tomorrow , I appreciate the help and quick responses

 

I've got the same problem. Guess I'm going to have to Jack up the car and check. Thx!

 

I know I'm digging up an old thread but I found it when researching similar symptoms for my car and wanted to post what was the issue for me in case anyone else stumbles across it.

All of the symptoms my car was experiencing were pointing to it looking like a driveshaft or u-joint issue. Turns out it wasn't either of those at all though. For me, the issue was both of my rear brake calipers were seized up which had caused both rotors to warp quite a bit and led to me feeling a lot of vibration in the rear of the car when going over 70 mph.

 

Did your brakes vibrate otherwise? Did you get screeching sounds driving slowly in reverse? Or a lopsided scraping sound at slow speeds?

Might as well threadjack since its so old..... I've had this vibration issue, hadn't even thought it was the drive shaft. I get a scary vibration, so much so that I can't see clearly out the rear window . It feels like it comes from the mid-rear; irrespective of RPMs, but always at 60-75+mph.
Slowing down to <40 gets rid of it and I can go back to 60+. No change in symptoms when loading left or right wheels. I stop in a dead straight line, but have squeaking when I reverse out of my spot in the morning.
🤷*♂️

 

I did have a slight squeaking when moving in reverse. Or if I was driving very slow down my driveway, for example, I could hear an intermittent "squeak". I knew that one of my calipers was probably starting to seize but I had no idea both of them were.

 

I had serious vibration coming from under car at highway speed. Put car up on jacks, and reinforced support with bricks and notched wood under frame rails. Took off tires and got them checked for balance 1/2 ounce and 1/4 ounce out of balance would not account for the severity of vibration being felt. Turn car on, turned of VDC and started runing through the gears as gently and smoothly as possible to see it speed related. Vibration felt more dramatically at would have been 70+mph. Used power seats with wedged hockey stick to gently apply gas in 5th at 4000rpm. Slid under car and driveshaft running out (wobbling when spinning) about 1/64 to 1/32". Stopped car to look for missing balance weight or worn parts. Found out that nissan dealership must have forgotten to tighten all four bolts connecting driveshaft to differential when recently replacing clutch. One bolt missing and definitely capable of cusing serious inbalance and vibrations. 4/4 interactions with brantford nissan disappointing so far. Wonder how much damage this has cuased to rest of driveline.

Thanks brantford nissan🤬