C6 skipping second gear
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Elder User
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C6 skipping second gear
I posted a question last night about the modulator and solved it (vacuum line worked loose). But another issue I noticed that I think has been there for some time:
My transmission, when in 'D', literally skips second. It goes from 1 to 3. when I manually do 1,2,D it works just fine and second gear is just fine. what I also notice is that when in D, the shift to 3rd is a bit delayed, with the shift occurring around 20-25mph.
Is this an intermediate band adjustment? I know NOTHING about transmissions and interestingly, this transmission was just rebuilt in January 2014 with new valve body and I think a more aggressive shift (e.g. not so much the sloppy shift).
What do you all think?
My transmission, when in 'D', literally skips second. It goes from 1 to 3. when I manually do 1,2,D it works just fine and second gear is just fine. what I also notice is that when in D, the shift to 3rd is a bit delayed, with the shift occurring around 20-25mph.
Is this an intermediate band adjustment? I know NOTHING about transmissions and interestingly, this transmission was just rebuilt in January 2014 with new valve body and I think a more aggressive shift (e.g. not so much the sloppy shift).
What do you all think?
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Elder User
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Yes, the vacuum line is connected at the intake. Remember my motor is from a 67 Fairlane, so there isn't the tee. I have a kind of square block at the base of my intake, on the right rear corner, where the vacuum source is. My truck had the provision of the two lines going down to the modulator, but someone had long since changed out to the single hose modulator.
I haven't yet checked the vacuum going to the modulator. Good idea, though. Last night I did report (separate posting) on having shifting difficulties, but that was an easy fix - my vacuum line had worked off down near the modulator.
I think this shifting from 1-3 has been going on almost since the rebuild...
Lead Driver
Joined: Nov 2006
Posts: 5,217
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From: Pa.
Hi, modulator wasn't replaced after the rebuild in January. I put one on in June 2013 thinking that would help my old transmission, but the problem with the transmission was far worse. My only point was that I felt like the modulator was still good and so did my rebuilder
Yes, the vacuum line is connected at the intake. Remember my motor is from a 67 Fairlane, so there isn't the tee. I have a kind of square block at the base of my intake, on the right rear corner, where the vacuum source is. My truck had the provision of the two lines going down to the modulator, but someone had long since changed out to the single hose modulator.
I haven't yet checked the vacuum going to the modulator. Good idea, though. Last night I did report (separate posting) on having shifting difficulties, but that was an easy fix - my vacuum line had worked off down near the modulator.
I think this shifting from 1-3 has been going on almost since the rebuild...
Yes, the vacuum line is connected at the intake. Remember my motor is from a 67 Fairlane, so there isn't the tee. I have a kind of square block at the base of my intake, on the right rear corner, where the vacuum source is. My truck had the provision of the two lines going down to the modulator, but someone had long since changed out to the single hose modulator.
I haven't yet checked the vacuum going to the modulator. Good idea, though. Last night I did report (separate posting) on having shifting difficulties, but that was an easy fix - my vacuum line had worked off down near the modulator.
I think this shifting from 1-3 has been going on almost since the rebuild...
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Elder User
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I have no kickdown rod on my motor - the carb/intake/engine were replaced years ago and when I bought the truck there was no kickdown rod present. The kickdown lever on the transmission is spring loaded, so unless the spring went missing internal inside tranny, that shouldn't be an issue, correct?
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Elder User
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In my experience, this has never been the case. The kickdown rod is only there to delay shift points under heavier acceleration. Under normal situations, the kickdown rod is never engaged. I have driven many automobiles and trucks without kickdown rods. True, they are more 'convenient', but that's the extent of it. Now if the actual lever on the transmission is 'bound', that could do something.
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Lead Driver
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From: Pa.
Under normal situations, the kickdown rod is never engaged.
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Cargo Master
Joined: Jul 2005
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From: Kansas
you're lack of a kickdown is not the issue. According to my old C6 book you should be checking out the intermediate band, intermediate server or valve body. I don't recall for sure, but I think if the trans works fine in 2, then that proves out the band and server...I would suspect one of the valves in the valve body associated with applying and releasing the intermediate server are having problems.
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Elder User
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I called the mechanic last night. He suspects the modulator (either bad or needs adjustment). I think the first thing though is to confirm that engine vacuum is sufficient at the rear intake manifold port that I'm using.
What tool do you stick in the modulator to adjust the shift? If it's the same hole that the vacuum hose attaches to, a small screwdriver won't fit in there?
Should I turn clockwise or CCW?
What tool do you stick in the modulator to adjust the shift? If it's the same hole that the vacuum hose attaches to, a small screwdriver won't fit in there?
Should I turn clockwise or CCW?
Cargo Master
Joined: Jul 2005
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From: Kansas
I misread your first post, I thought you already replaced it...it usually take a small allen wrench...screwing in the screw will delay shifts. if you swap it make sure you put the small pin back in (assuming it is still there).
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Elder User
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I also read where not having the pin or pin screwed way out will cause the symptom I'm seeing. Hopefully this is the case. I've been driving this way for 9-10 months and no problems - just no second gear...
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