when i reach 35mph a noise is heard in the back i thought it might be my wheels bearings but i have check it and it i s not them. it is a loud noise tat can almost be felt in the front seat i have a nifferent suspension from the stock one not sure f that couldd be the problem. even if there is not gas given as long as im going faster than 35ph i can hear the niose.

 

I used to drive an 81 dodge aries station wagon in another life, and it had that very same problem. It turned out to be that the tire had gotten warped. Not the rim but the rubber itself had changed shape. I was stummped for the longest time and so was my mechanic. It might not be the same thing for you but it was the first thing that came to mind. Hope you get it sorted.