I have looked for thread about this issue and have not found any information or answer to this problem. So, I'm having issues as well and its starting to **** me off. well i'm having a vibration noise (humming) and its very bothersome, I notice it more on 6th gear at around 50 to 60mph. Here is what has been changed recently since i was going to change them out anyways. I changed out all wheel bearing(timken). Just changed out the axles with new stock axles from autozone(duralast) and swapped out the entire diff and pumpkin from a another z with very low miles and installed spl solid diff bushings. The only thing i can think of is the propeller shaft, transmission bushing. I have rotated the propeller shaft like the fsm tells me too but still have vibrations but not sure if it propeller shaft i don't want to throw $700 away on a brand new shaft. I guess i will change bushings on transmission and go from there huh.. this has been very annoying. I also am running a jwt clutch combo has about 30k miles on it and the chassis has about 99k. If anybody could i would really appreciate it, thanks.

 

the spl diff bushings make a humming noise around 2k-2500 rpms if you listen closley maybe its that?

 

thing is i have never heard this before and i'm feeling a slight vibration on the gas pedal as well.

 

any help guys.

 

Wow. Do you realize how much money you would have saved by having your car checked by a professional (they use microphones to locate noises) rather than just throwing parts at the problem?

 

what do you mean throw money at it one of the wheel bearings where worn out and so i decided to replace all of them for having about 100k miles on it and the axles and alot of corrosiong on the shafts, i've taken the car to nissan and all they told me was the diff ring and pinion bearing was worn out so i found a full diff that a friend was parting out for about $100 and bought that and installed it same noise so throwing money not really but nissan didn't help at all they used their special tools or stethoscopes and well i just have pin pointed to propeller shaft i just don't want to buy a brand new for nothing if it not that or it may be transmission issues. So nothing has broken yet but noise is just getting annoying.