Is it OK to ask about a 57s Chevy stick shift transmission?

[racprops]

I just got a pair of Chevy 3 Speed with Overdrive Looking for ID and rebuilding instructions.

From a 1957 Chevy Saginaw or Muncie 319 4 bolt Three Speed with overdrive

#1 On main body GM3 3845122 and J1856 On the shifter cover 3731911

Question is what is it and what are the Gear ratios

Need rear slip yoke/flange shaft is 16 Spline and 1.176 Inch OD

#2 On main body GM…. 3744920 B132 On the shifter cover: 3848534

Question is what is it and what are the Gear ratios

Need rear slip yoke/flange shaft is 16 Spline and 1.182 Inch OD

Thanks

Rich

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