I bought an 07 v6 accord back in april, everything as fine then.

Recently I started to feel that the car shakes gently but noticeably through the seat when I accelerate through 20 mph. It goes away when I reach higher speeds. The steering wheel doesn't shake or vibrate, and there's no noise when the car shakes. Front two tires are 5 months old and rear two tires are brand new.

What are the probable root cause?

Thanks.

 

Three possibilities:

1. Bent wheel
2. Bent axle
3. Failing CV joint in axle

 

Also

Tire is out of round
Motor mount (hydraulic style) failing

 

Swap your wheels around to see whether it feels like it moved to a different corner.

 

I actually went to a shop and had those checked out. Those parts are In great condition.

A friend pointed out it might be the transmission's problem. Honestly that's what I guessed to be the cause at the first place.

 

But the transmission is not giving any malfunction code. I read cases of people encountering the same problem, and there're two that replaced the transmission and fixed the problem.

 

I highly doubt changing the transmission will eliminate a shaking issue.

 

So if it's not anything bent, nor cv joints and engine mounts, what's your next best suspect?

 

Axles.