C6 Stuck in 3rd
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From: Norton, MA
C6 Stuck in 3rd
Hi, just finished rebuilding my C6, but something is still off. I have great engagement in all 3 speeds when I shift manually from the column. Better than before even when my transmission was good, drops right into gear and takes off. When in drive though (supposed to still be full auto), I am stuck in 3rd gear. The setup actually isn't horrible, I have 1 and 2 on the column, and D=3, but, something is obviously wrong, and since I don't know what it is, I can't just leave it like that and hope that D always stays 3. So what might be my problem? Is this a governer issue, valve body, vac modulator?
I'm hoping somebody comes on and tells me that this is some kind of classic problem, but whtever input you have helps.
Thanks, AleX
I'm hoping somebody comes on and tells me that this is some kind of classic problem, but whtever input you have helps.
Thanks, AleX
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Posting Guru
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From: Norton, MA
Aghhhh, I just went through the whole process of puting the t case back in and all that, I'd hate to have to go through that again, and I dissassembled and cleaned the governor just like everything else, but I guess it's possible something still could be wrong.
Any way that I can tell or at least get some indication whether it's the gov or valve body?
Thanks, AleX
Any way that I can tell or at least get some indication whether it's the gov or valve body?
Thanks, AleX
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From: Norton, MA
O no that's exactly what I've been doing. That's why this situation is actually kind of workable. I seem to be able to shift up and down anytime I want, at any speed, and for the time being at least, D is stuck in 3rd, so I can shift through the whole range very well.
What does that mean though? And what would shifting down into 2 around 30 do for me, or show me?
What does that mean though? And what would shifting down into 2 around 30 do for me, or show me?
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Posting Guru
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From: Norton, MA
Ahhhh OK, so if it's a governor problem then that means that one of the gov valves is stuck in it's bore? I find that really hard to believe, I was so careful with all the valves, and the gov especially is such a small thing, it was really straightforward to keep it and the baseplate clean while I assembled it all, but OK, I'll look into it.
If it's valve body, what would be wrong there?
AleX
If it's valve body, what would be wrong there?
AleX
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Cargo Master
Joined: Jun 2003
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From: Somewhere Saskatchewan
Yes there are only 2 valves in there but the small one can get stuck very very easily, no matter how fussy you are.
If it's in the VB one or more of the valves could be stuck.
Did you install a gasket in the vb and if so did the holes line up?
If it's in the VB one or more of the valves could be stuck.
Did you install a gasket in the vb and if so did the holes line up?
Last edited by stuart1; Jun 14, 2010 at 10:47 AM. Reason: schpellink airoar
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From: Norton, MA
Yes I used a gasket, and yes all the holes lined up. I also installed a shift kit when I rebuilt it all, it included a few heavier springs, an elimination of what I think was the 2-3 check ball, and one thing that I thought was very strange, one valve near the corner of the VB, a very small one, on the side with the big retainer plate, was supposed to have a plug placed on top of it, so as to completely immobilize it.
What do you think of all of that? I did weeks of research and talked to tons of people about what kit to buy before, but as far as the instructions in the kit, I just went right along word for word. Should I not have been so trusting, could some of these mods be messing me up?
AleX
What do you think of all of that? I did weeks of research and talked to tons of people about what kit to buy before, but as far as the instructions in the kit, I just went right along word for word. Should I not have been so trusting, could some of these mods be messing me up?
AleX
Transmission Rebuilder
Joined: Jul 2008
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From: North Georgia
If you have the 2-3 shift valve installed incorrectly it will start off in 3rd.
The small valve called the cutback valve can be pinned to maintain maximum line pressure, its ok to do this, I have done this many times. If you have the valve body off I can show you how to air check it to see if the shift valves move.,
If your valve body is good it will have to be in the governor, it is possible to be miss assembled.
The small valve called the cutback valve can be pinned to maintain maximum line pressure, its ok to do this, I have done this many times. If you have the valve body off I can show you how to air check it to see if the shift valves move.,
If your valve body is good it will have to be in the governor, it is possible to be miss assembled.
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From: Norton, MA
Well that's very interesting. The valve I pinned with the plug provided is the servo modulator valve. And the kit told me to install a check ball in the bore of the cutback vlave, before puting the cutback vlave in.
I know what you mean about it being possible to misassemble the governor, I actually did it that way at first, but then fixed it right away.
What do you think of the servo modulator valve being immobilized though?
AleX
I know what you mean about it being possible to misassemble the governor, I actually did it that way at first, but then fixed it right away.
What do you think of the servo modulator valve being immobilized though?
AleX
Transmission Rebuilder
Joined: Jul 2008
Posts: 1,570
Likes: 63
From: North Georgia
Shift kits usually pin it with a plug and blocks the cut back valve with a ball.
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