[Joe37]

Lets go with this,
1964 and older, all vacuum operated, manual or automatic transmissions
GTO, and big car

1965 - 1966, automatic transmissions , vacuum operated tripower
1965 - 1966, manual transmission, mechanical tripower

Mechanic linkage was available over the counter prior to 1965
Aftermarket kits also available

[60sstuff]

Originally Posted by Joe37

Lets go with this,
1964 and older, all vacuum operated, manual or automatic transmissions
GTO, and big car

1965 - 1966, automatic transmissions , vacuum operated tripower
1965 - 1966, manual transmission, mechanical tripower

Mechanic linkage was available over the counter prior to 1965
Aftermarket kits also available

That looks correct.

[60sstuff]

Joe,

Kickdown switch for Automatic transmission with Tri-Power.

BIG CAR, 65-66 had the switch located “under the hood”.
A bracket on the LH side of center carburetor held the automatic kickdown switch.

GTO, 1965 also had the switch located as above “under the hood” on LH side of center carb.

GTO, 1966 now had this transmission kickdown switch located “inside” above the accelerator pedal.

A few on this site haven’t figured this out yet.