Turbo 400 problems

[bassin4507]

My turbo 400 won't downshift, when I floor it. The only way I can get it to downshift is to manually do it. I know there is a vacuum line going from the carb. to the transmission, is this what makes it downshift? Or is there supposed to be a cable ?

 

[HarryH3]

The downshift signal on a Turbo 400 is electrical. There should be a switch on the gas pedal bracket that turns on when you floor it. That sends 12 volts to the connector on the drivers side of the tranny and engages kickdown mode.

 

[k20]

where is it at on the gas pedal bracket? Mine downshifts sometimes and sometimes it dont, Im thinkin maybe the switch mount has come loose, or broken, so it only engages sometimes.

 

[rubbinz raczn]

inside truck should be the only switch on the gas pedal.

 

[k20]

I mean is it at the top of the arm or down nearer where it bolts to the firewall, cause I hadnt seen a switch down there that I remember

 

[rubbinz raczn]

it's closer to the top. above where it mounts to firewall with the three bolts. a chiltons manual will have the correct adjustment procedure. it's easy! my truck was an original 4 speed so i didn't have the switch parts so i used a lokar performance kickdown cable kit. it mounts to carb linkage via a cable. not as good as a factory setup but it works.