It's an overdrive, correct? And you lost 3rd & 4th? That indicates the lock up clutch took a dump since the verter locks in 3rd and 4th. Just my $0.02
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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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