General Motors RPO build codes
From Crankshaft Coalition Wiki
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*M21 4-Speed Close Ratio | *M21 4-Speed Close Ratio | ||
*M22 4-Speed Heavy Duty | *M22 4-Speed Heavy Duty | ||
| + | *M31 Torque Converter 2-Speed (Used for 1964 Lemans - Believed to be for the 2 Speed Super Turbine / ST-300 Automatic Transmission) | ||
*M35 Powerglide Automatic 2-Speed | *M35 Powerglide Automatic 2-Speed | ||
*M38 Turbo 350 Automatic | *M38 Turbo 350 Automatic | ||
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