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#7
05-07-2016, 12:04 PM
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The high performance cars did have a different designation. I believe CX was another one that people look for. L78, L72, LS6 cars all had a different coded transmission than the lower HP cars. I believe the main difference is the shift governor and torque converter.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi 1969 Malibu COPO L72/M20/12 bolt 3.31 posi 1968 Malibu LQ9/4L80E/12 bolt 3.73 posi 
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