All of the responses are correct. Per the GM Heritage site, the high side 5-32 is 6.40 :1, the low ratio is 8.74 :1. I'm real happy with doner 2 speed that DougH6100 was able to part with, same ratios and a direct fit in my '57 LCF corporate axle. Before the transplant my truck would top out at 51 mph at 4000 rpm, now it can do 62 - 63 mph. It's pretty happy at 55- 60 mph around 3700 - 3800 rpm. Tire diameter will make a difference also, my drive tires are 10R-22.5, they are taller than the old 10.00-22.5 but I have not researched the diameter.
