Car shakes violently at 70mph

[NiSilS14]

I tried looking this up, but doesn't seem to fix my problem. Well, just like the title saids the car shakes violently at 70. I was thinking it might be the alignment, so I went to get that done, but it still has the shake. I also have Tein T/C rods, might that cause the problem? So I was wondering what other possibilities of what might be wrong. Again it is a 95 240SX. Thank you in advance.

[silvia tunner]

are your wheels balanced?

[Altiman94]

I would also say take your wheels in to get balanced.

[x-man]

Yup. Check the wheels. They might be out of balance or "out-of-round"... Does the vibration stop at some point beyond 70mph? Have a buddy drive next to you at that speed and he should be able to confirm at least one of your tires bouncing like a basketball if that's the problem...

btw - didn't the tire shop at least mention "balancing" to you when you asked for the alignment and told them about the vibration?

[Big Red]

My wifes car did the same thing, turned out the wheels her brother put on it had the holes bored out to fit the lug pattern.

[sen-pai]

are wheels hub-centric? correct lugnuts. take it to a les schwab or discount tires and ask them to do a road force on the tire and wheels and that will tell u exactly what the problem is. i work at discount tire so thats y i know