The 74 Petty catalog has gears as high as 6.17 and a tons of intermediate gears. Stuff like a 3.07, 3.64, 4.75... Crazy stuff. All Detriot Lockers for them (rachet).

I've seen a picture of a room stuffed full of 8 3/4's at Petty Enterprises. Maybe there's still some floating around down south.