Thread: 4.88 gearing question for 1/4 mile

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I would recommend running a bigger tire 30" should work ok with the 4.88 putting you through the traps about 6500 for about 120mph... Or keep the 28" tire and go to 4.56:1 should be about right.... Rule of thumb for shift point is 10% higher than power peak then fine tune higher or lower from there. Good luck with the Pinks deal... I went last year and had my quickest time ever the one run I got on test day before rainout... Day of the show both my test runs were off turns out I broke a valve spring on my one test run (d'oh!)

-Chris

Hey boys cool site, my car used to 1/4 mile car . with 430 gears. 11.90 @114mph. used to shift at 6200-6500 cross traps at 6000 -6200. well its been 2 + years since its been down the 1/4 as im in 1/8mile country. Changed heads, springs, and added more gear. As Stynie said im concerned im gonna be out of rpm at the stripe. Its a stroker with a 1500 -6500 power range. My concern is seeing 7K at the stripe. Its a old piece but consistant bracket racing car. Bobby

Thanks for all the help guys.

Originally Posted by skids72

I would recommend running a bigger tire 30" should work ok with the 4.88 putting you through the traps about 6500 for about 120mph... Or keep the 28" tire and go to 4.56:1 should be about right.... Rule of thumb for shift point is 10% higher than power peak then fine tune higher or lower from there. Good luck with the Pinks deal... I went last year and had my quickest time ever the one run I got on test day before rainout... Day of the show both my test runs were off turns out I broke a valve spring on my one test run (d'oh!)

-Chris

No funding for a gear change right now. I still have my 430's on the shelf but that would make me a little slow for Pinks.