HI, new to this forum. I bought my a SC400 for $300 but the interior was a total mess and need a lot of work. Engine and transmission is in great condition but getting a weird vibrations and a lot of noise when running about 60-70. My car is alright when in cruise and I have my feet in the gas pedal but getting a weird noise and vibrations from underneath after getting my feet off the gas. I tried to put it in neutral while running at same speed but it it still there. So the problem is the noise and vibrations when the gas is not pressed when running about 60 and up. It is noisy and so annoying. Any ideas? Replies will be so much appreciated.

 

Exhaust? I get a nice 'humming' when I let my foot off the gas at that speed, maybe somethings loose on your exhaust system?
But in all honesty, it could be any of a whole plethora of things. I'd just take it to a shop..

 

I think i have the exact problem you're having right now, but not 100% sure. Does this vibration come on and off at intervals of say 1-2 seconds? If so it might be a driveshaft issue.

Just to be sure though, get all four tires balanced and rotated first and have an alignment done after that. If that doesn't solve the problem try replacing the transmission mount (easy DIY job, do a search on it in the performance section) and see if that helps at all.

 

Thanks you you pretty much solved my problem

 

Well i don't know if i've solved it, but i might have found it. I'm still not 100% sure what it is.

 

Mine does not have any intervals but I know for sure its not from my wheels or mount. I serviced the differential 2 days ago and does not solve the issue. Does the drive shaft comes with some sort of bearings or some sort?

 

I forgot to say that you can hear the noise pretty strong coming from underneath with some vibrations? Is that an expensive fix? Right now im waiting for my bushings before getting my alignment. Thanks.