57 truck manual lists it as 0.70:1 - not sure why it wouldn't be in the 58 manual, they used that trans in trucks up to about 67 - maybe look for the 58 glove box operators book, might be in that .... in 58 they came out with some 'economy rear ratios' [when the 3.38 started I think] and maybe pushed those instead of the OD which usually came with the 4.11
Bill