One model of the series WW carburetor has a kickdown limit switch attached to the carburetor. The function of this switch is to provide a means of automatically shifting from 4th gear to 3rd gear by merely depressing the accelerator pedal to the floor at car speeds below 40-45 MPH. Depressing the accelerator to the floor when car speed is below 40-45MPH causes a sudden drop in venturi vacuum which permits the compression spring (B) to move the piston (C) and bring contact (E) between the end of the plunger (D) and the terminal block (F) to complete the circuit. This causes the transmission to shift DOWN into 3rd gear where it remains until the accelerator pedal is released, or sufficient venturi vacuum is developed to move the piston and contact away from the terminal block.

At car speeds above 40-45 MPH there is sufficient venturi vacuum to overrule the compression spring and hold the circuit open to keep the transmission in 4th gear.

Not all WW carburetors used this switch. Used on automatic transmission applications.

The kickdown switch is used to shift the transmission down when the driver stomps on the gas.

Place spring #2 in hole of contact piston #3 & insert piston with spring in housing with contact pin nearest terminal block side of housing.

Assemble gasket and plate. Insert terminal block #1 in housing and replace retainer plate, screws and terminal clip.

Place spring #4 on plunger #5 and insert plunger in housing, then assemble washer, gasket, retainer plate & screws. Tighten all screws. Press in on the plunger to make certain that plunger returns freely to full release.