AJ06GT

Okay, so this is something that I've felt before, but it kind of started to worry me a little just a second ago. Every so often when I accellerate, mainly at higher RPMs, I can feel a rythmic vibration, like something is rotating and hitting something lightly or out of balance, from underneath the car. I thought at first it was just the stock driveshaft wobbling a little at higher RPMs, but just now I was driving down the road and could feel it going about 60-70 MPH, RPMs probably around 2-2.5k. It makes me think that it's something rotating out of balance, because it's not what i'd expect from something rotating and hitting something since it's not very hard. It's not something you can hear at all, and you can just feel a little vibration in the seat coming from underneath.

Any ideas what might cause something like this? It may not be something to worry too much about, or it may be something bad. I've never felt it at lower RPMs just cruising before now so I'm getting curious. I don't want something out of balance and destroying my entire rear end or something.

jmmorgan82

mine does this between 80-85, I suspect the driveshaft

AJ06GT

If that's the case, then I assume it's nothing to be worried about. This is what I suspected at the start and figured that if it bothered me enough I could replace it with a lightweight aluminum driveshaft.

jmmorgan82

Have you had a gear swap done, or any tranny work? Basically, anything that would mean the driveshaft was removed?

rmtaylor78

i've had the same problem with my car since the day i drove it off the lot. i've been back to the dealership 5-6 times arguing with them about it and the only time that they actually fixed it, it turned out to be the tires. the had to do a "road-force balance" on my tires which as i understand is different from a regular balance. they put the tires under the same conditions they would be at around 60-70mph and then balance them. they finally fixed it about 3 months ago. i went fora free rotation/ oil change and it's screwed up again. amazing. i think i just need to buy some better tires. (ps- they were new tires when they came from the dealer)

AJ06GT

Nope

Hmm... it's almost time for new tires and rims anyway, if that's the case then it would go away then.

cjb7804

Be sure to check the u-joints on your drive shaft. Could be getting loose and causing your vibration.