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I have no idea also, just know it's a stock 66 impala powerglide I ran in first at the 1/4 mile track my powerglide in first that's why I got the thinking if I'm going to a bigger track (butler...

I have a 9" with 4.11 ring and pinion runnin a sbc 350 with a 2 speed powerglide. (1.82) in low and I'm gonna be switching to a 3/4 mile track? What should I switch to 6.66 and run in high 1:1? Or...