The 66-67 GTO and LeMans shifter when used with a 2-speed automatic transmission had detent #1 installed. The TH400 was not offered in these cars until1967, and then it was usually/always(?) paired with a His/Hers shifter. The TH400 was, however available in the big Pontiacs as early as 1965 and they used the "same" shifter with detent #2
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