I kinda lucked out with gearing on my car. My Duster has a 4.88 rear gear in it and a 14-32 slick. When I started running 9.30’s my old 408 was winging higher than I needed it to or wanted it to. I was kicking around going to a 4.30 and boom within months the 4 tracks that I frequent all switched my class over to 1/8 mile. All is good now. Not sure what I would do now if I had to buy a new set. I guess I should give that some thought. I wish I had a Ford 9 inch as I have at least 3-4 carriers