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Discussion Starter · #1 ·
What exactly does the kickdown linkage do? I just put an auto in my truck and now when I push the brake and have it in gear it will bog down and die. I haven't got the kickdown linkage installed yet, is that the problem??
 

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Doubt it. From my understanding the kickdown rod is supposed to downshift the tranny to 2nd gear when cruising along in 3rd. It's supposed to be used for passing and acceleration.
 

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It also tells the tranny how much throttle you are giving it, so it can control the shifts. That's how it knows to give gentle, low speed shifts under light acceleration, and nice firm, late shifts when you nail the pedal to the floor. I don't know much about auto trannies, since every vehicle I've owned up to now has been stick, but I'd think if the kickdown valve is left open wide enough, it could keep the clutches from releasing because it thinks you're giving it gas.

Just my $.02

Matt {peace}
 

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Its like Ramman4 said, it controls the shift points in regards to throttle position.
 

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Discussion Starter · #5 ·
Well on a chevy you have a vaccum line that keeps truck from dying when in gear and foot on brake, so what handles this on a Dodge??
 

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I'm not familiar with chevy's, is that vaccum line you're talking about on the trans? Because there are no vacuum lines on the 727.
 

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K/D linkage controls the line pressure in the tranny, which in turn controls the shift points. If you drive around with the K/D unhooked, be prepared to rebuild your tranny sooner rather than later. It will be runing WAY too low line pressure, which allows the clutches to constantly slip, burning up the trans very quickly. Soooo.....
DO NOT DRIVE WITHOUT THE KICKDOWN HOOKED UP! One thing you can do to get you by for a few days is to wire the kickdown lever on the tranny about 1/2 way back. This will keep line pressures high enough for moderate cruising without destroying the trans. Just don't pound on it in this condition. It will likely downshift as you come to a stop as well.

Stalling when the brake is depressed....do you have power brakes? Sounds like a major vacuum leak (brake booster)

-SM
 

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The kickdown linkage does essentially what Taz and Ram said with some minor variations.

Question:

When your vehicle bogs down and dies, are you in motion or idling in PARK?

Need more detail here.

Mac
 

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Slanted: That is what my thought was (major vacuum leak) but wanted to eliminate other things first, but did not notice he said he was in gear.
 

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76POWER WAGON said:
Well on a chevy you have a vaccum line that keeps truck from dying when in gear and foot on brake, so what handles this on a Dodge??
Vacuum modulator, Throttle valve cable, kickdown linkage, they're all similar. My 81 Regal had a vac mod line and my 89 Sierra had a TV cable.
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In the for what it's worth department regarding kickdown linkages, In addition to connecting the rod, there is a spring at the carb/tbi end that needs to be hooked up for everything to operate correctly
 
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