So I have been dealing with this issue for quite some time in my 04 V6. I have been experiencing helicopter type noises at 40mph + and a rhythmic vibration through the pedals and floorboards. This happens while accelerating and coasting. First off, I bought a brand new rear pair of 17" cobra r rims wrapped in bf Goodrich gforce comp 2 all season tires 245/40z from American muscle. The fronts however, I bought used with the same tires. The front rims seem a little different in that I have to use a long socket to get the lugs off ( a regular lug wrench won't clear the diameter as they are cone shaped, but fit fine on the new ones. Anyway, I convinced myself the front hubs were going so I replaced them both. Which makes the ride a lot smoother, but I still experience that (helicopter type) noise and a rhythmic vibration in my gas pedal and floorboard at higher speeds which seem to me are coming from the drivers side wheel well. Could it be that the used rims/tire I got are slightly bent or out of round? also those tires are not all season the are the regular force comp2. Any input would be helpful.

 

Any tire worthwhile tire shop can spin the tires on their balance machine to check for a bent rim. They can also check the tires for any separated belts. Even new tires can have that happen sometimes. It's a mfg defect that often does not get discovered until they spin it on the balance machine or you drive it down the road. Type of tire is irrelevant.