Vibration under power at 55-60mph+ ?

[H_Cubed]

I have an '06 Lux with the suspension package. 25k miles. I recently installed the Coginito shocks and cranked the TB up to take the rake out. Starting height was 22.5", after 6 turns it was up to just a little under 24.0". I had it aligned.

I have never had any issues with strange sounds or vibration that I was aware of. At low speeds there's nothing noticebly different. Now however, at speeds on the highway, and under power, theres some vibration being felt through the steering and the floor boards. Once you remove your foot and coast the vibration goes away. If the vibration continued while coasting I may have suspected that the tires needed to be rotated/balanced.

Is this something others have experienced after doing a similar mod? Is this indicative potentially of some bigger problem like a CV joint going or a diff/transmission problem?

[Big Dad]

Yeah I had a problem like that when I first bought my 06 Lux w/suspension pkg. At hwy speeds from 50 and up the vibration got worse. The dealer attempted to balance my wheels but couldn't. So they swapped all four wheels with another vehicle on the lot. There was a problem with the stock tires from sitting on the lot for such a long time. You might have lost a wheel weight. It probably needs balanced.

[H_Cubed]

I had the tires rotated and balanced today. The tire tech said the front passenger side wheel was fairly out of balance, and showed me some cupping which probably wasn't that apparent until the alignment was done after the TB crank. Runs smoothly now. Thanks for the advice.