C6 Shifting Problems
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Senior User
Joined: Mar 2006
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From: Morganton, NC
C6 Shifting Problems
Just done a headgasket job on my truck, and now my transmission will not change gears until 5000 RPM. Could this just be a major vac leak to the mod valve or have I left some linkage unhooked?
Hotshot
Joined: Aug 2006
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Are all the vac lines in the right places ?..Did you remove the kick down linkage ?
Tuned
Joined: Jan 2009
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From: Decatur, AL
There is a lever on the drivers side of the tranny for the kickdown feature.
There shoulkd be a rod going from the carb linkage on the driers side, at the rear of the linkage, that connects to the transmission.
Sounds like that lever is stuck down.
There shoulkd be a rod going from the carb linkage on the driers side, at the rear of the linkage, that connects to the transmission.
Sounds like that lever is stuck down.
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The kickdown has nothing to do with it, whether it is in the neutral postition or in the "kick-down" position.
The vacuum modulator is not seeing an adequate amount of vacuum, either because it is disconnected or there is a massive manifold vacuum leak.
Josh
The vacuum modulator is not seeing an adequate amount of vacuum, either because it is disconnected or there is a massive manifold vacuum leak.
Josh
Hotshot
Joined: Aug 2006
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The trans will governor shift ...
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Laughing Gas
Joined: Apr 2001
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From: New Glasgow, Nova Scotia
Since you were working around the vacuum line for the modulator valve, check to make sure it was reconnected on the intake. Also check the steel section of the line going to the valve, mine was rotten under one of the clamps that hold it to the transmission, the truck ran like crap and would not upshift into drive till 50mph .
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A kickdown isn't needed and won't effect the shifting like what he is experiencing.
Josh
Hotshot
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If the kick down linkage is stuck down , the trans will stay in first till it governor shifts .The symptoms are the same as no vacuum to the modulator .... What does that have to do with you not having one ?
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If the kickdown is wired or stuck in the "engaged" position the tranny would shift 1-2-3 like normal during normal driving. I tried it several years ago thinking I would get firmer shifts and it did absolutely nothing.
If the engine speed and road speed dictates from a standing stop higher line pressures the governor, modulator, servo and VB are in control, kickdown does nothing.
The symptons are nowhere near the same and quit making the OP chase at nothing.
Josh
If the engine speed and road speed dictates from a standing stop higher line pressures the governor, modulator, servo and VB are in control, kickdown does nothing.
The symptons are nowhere near the same and quit making the OP chase at nothing.
Josh
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I didn't think I would have to explain such simple things like I am talking to a 5 year old. Scratch that, a 3 year old, the 5 year would have understood.
Josh
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I know your type . Can't convince based on facts ,resort to personal attacks .
If the trans is forced to stay in first gear , it will governor shift , period . Driving a hundred thousand miles without a kick down linkage is not proof of your argument. . I had the same problem once , the linkage was the problem . I also had a modulator vacuum problem ..I was trying to help OP . You were more concerned with something else ....
Maybe your ego ?......
Hotshot
Joined: Aug 2006
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Wiring i.e. using bailing wire, a zip tie, etc. to manually keep the kickdown lever in the ENGAGED position.
I didn't think I would have to explain such simple things like I am talking to a 5 year old. Scratch that, a 3 year old, the 5 year would have understood.
Josh
I didn't think I would have to explain such simple things like I am talking to a 5 year old. Scratch that, a 3 year old, the 5 year would have understood.
Josh