sean1997 Posted June 11, 2015 Share Posted June 11, 2015 In 1962 and 1963 the sales code for the 4-speed was A7, so this should be on the trim tag in 1962 and 1963. 2L is the group number system code for 4-speed. It would be read Group 2, option L. The group numbering system was used for 1964-1967. You may see the code 2L on the trim tag or 2 followed by a string of letters, one of which would be L. You may also see the UPC/RPO option code M20 and I've even seen one that just says "4SPD. SYN". See attached pictures from 4-speed Buicks. 2 Link to comment Share on other sites More sharing options...
NTX5467 Posted June 11, 2015 Share Posted June 11, 2015 WOW, Sean!! Great information and documentation!! Thanks! NTX5467 Link to comment Share on other sites More sharing options...
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