1966 GTO Tri-Power A/T has the downshift control switch #9783241 (#1242101) inside under the dash just above the accelerator pedal.
1965-66 Pontiac Tri-Power A/T has the downshift control switch #9781141 (#9785545) on a bracket mounted to the center carb.
HTH
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1966 GTO Tri-Power
1970 GTO TheJudge
http://www.poci.org/
http://gtoaa.org/
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