Hey everyone! Recently purchased a 1990 Z32 and about a month of driving the 300zx, it started to vibrate...really bad. The vibaration is only noticable between 5-20mph and it almost feels as if it is originating from the rear of the car.
The unusual part is once I accelerate past 20-25mph, the vibration disappears. Also, sometimes the vibration is worse than the pevious event and sometimes it's less severe. Lastly, it comes an goes, i'll leave my house and everything is fine, get on the freeway, but when I get to my destination, it strikes again when im cruising through the parking lot...

The car is a blast to drive but i'm hesitant to drive it around because of this issue. Any help would be greatly appreaciated! Thanks in advance guys!

 

Probably the driveshaft (center support bearing is most likely, as they do wear out and require replacement after 100k+ miles, or so)... search for how to diagnose. Center support bearings aren't too expensive, and they're not hard to replace if you have an impact gun.

P.S. They're also necessary for reducing NVH, so keep that in mind when someone recommends a one-piece driveshaft.

 

I'll try to jack it up to see if I can take a look at it today. BTW what's NVH? Thanks ZLover!

 

Auto industry term for Noise, Vibration, and Harshness.