1980 c10 kickdown

[kris's66lwb]

My truckl 1980 chevy big 10 bonanza with a 350 th 350 combo it wont kick down i hit it and push in the the secondarys and it just boggs out and wont accel but in nutral or park it acts fine how do i adjust the kick down so it works

[Dan1969]

Is your vacuum advance connected?

[vtwinsport]

open up your throttle full, tie it off with a zap tie or soemthing like that. then pull your kickdown cable as far as it will go toward the front of truck. tighten the kickdown there and then release the throttle. That shoudl do it.
If that doesn't fix it, you have timing or carb issues.

[kris's66lwb]

I donthave any adjustment of the kick down cabble its just a long slide type thing that latches on to the carb i know the carb is good its brand new and so is the distributor im getting good vac to everything i timed it to 14 btdc runs like a champ till i try to get it to kick down if i manualy put it in second if gose great

[vtwinsport]

do you run a factory gas cable and carb?

[kris's66lwb]

all factory q jet with a factor throttle cable and bracket nothing is aftermarket

[vtwinsport]

I cannot comment on the factory adjustments because I don't know anything about that setup.
Shifts properly in all other gears? Is it stepping down a gear at all when you floor it (ignoring the carb activity for the moment)?
That is something you need to make sure of. If its not changing gears then the cable adjustments must be off

[kris's66lwb]

ya it almost never steps down unless is sneek up on isome times and its not expecting it

[vtwinsport]

if its shifting through gears when driving, you know the vacuum modulator is working, then the kickdown is the area you need to be looking at.

Try this;
factory detent cable (kickdown) has a clamp screw, with choke off and throttle wide open, pull detent cable to rear of engine until wide open throttle stop is reached (far as it will go). Tighten clamp and test drive. Haynes manual- trans section.
good luck.