Bad Vibes

Hi TW, i need your help... bought a set of wheels/tires a couple of weeks ago... when they installed the new wheels and tires, i got vibrations from the rear end between 70-75mph. below and over those speed, the vibrations are not there. i brought the wheels back to 4wheelparts and they balanced it again. but still the same results. the vibrations seem to feel like a side to side vibration and not up and down. (if that makes any sense). any ideas on what could the problem be?

 

What did you put on and what did you have on it?

 

What tires did you put on. I have cooper discoverers and i have a vibe at the same speeds. I put the truck on my dads dyno and took it up to 75 and you can see the tire flexing and moving. I took it up to about 120 on the dyno but it smooths back out after about 85. I have never seen a tire do that before. They are shitty tires.

 

x2 on the dyno. I had a 2003 Dodge Ram that I built. I lifted it,put big wheels and tires on it. The Mopar club I belonged to had a "Dyno Day" . Holy Cow! Get them puppies spinning at a highway speed and up, it looked like they were filled with water they way they flexed and moved around. If you didn't have a problem prior to the new shoes....well, 'nuff said. Try rotating them. Maybe you have a bad one in the back. You'll feel it in the steering wheel if that's the case.

 

i put in a 16x8 Procomp 7032 with Toyo Open Country A/T 265/75/16. i never had vibrations on the stock wheels. i just got the vibes after the install of the new wheels and tires.

TicTacOma: i'll try rotating them like what you said.

thanks for the replies!

 

I would rotate the tires and see if it moves to the front. If it does take them back again and tell them.