Thanks for the advice but I have used 130#,150#,170# springs works best with the 150#. I have adjusted the shocks from 1 through 5 on my QA-1s. I have ran the psi from 18 all the way down to 12 psi. I have left from idle to all the way up on the convertor so you can see it's not like I went out one time and spun. The only place I fall short is the front end where the up grade is a set of QA-1 adjustables and thats it. I would like to make the car work with a set of $400 tires before I would spend major money on the front suspension. I have used these tires on other cars and they worked fine but like you said not all cars are the same.