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How do they feel on the street?
Also witch ones should i use at 3800lbs at the starting line?

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My car rides nice on the street. When I race I set my Rancho's on the "9" setting. On the street I set them on 2 or 3 to soften the ride a bit.
No sure what to tell you or suggest with your second question. The 002 & 003 springs are rated at 3000#-3200#. They lift the back end of my car up about 2". That's why I use the lowering blocks.
3800# HD springs actually drop the back end down. My friend uses them on his "65 "B" body.
Personal preference, I guess.