C6 shifting issues
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Posting Guru
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From: Dallas, GA
I think I saw you suggest that to someone else before and I agree, could be. That's why I just set it to where it likes it for now and leave it be
Hotshot
Joined: Feb 2004
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From: Marengo, Iowa
That is if I recall correctly it is the band servo. Either way, it is a servo. You don't want/need to go in there. The governor is behind the stamped steel cover with the wire clip over it on the driver side of the trans near the tailshaft housing.
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From: Dallas, GA
Also, another simple check is to be sure the downshift rod is connected, not all that uncommon for them to come off at the carb. If it does, it will settle downward and back, which will move the tv into position as if you are standing on the gas, delaying the shift points.[/quote]
Never had the kickdown rod when I bought the truck...I've since installed a Lokar kickdown cable. Seems to be working fine. Only pulls the lever at WOT and does pull it down to second...PITA to set by yourself....2 man job makes it easier
Never had the kickdown rod when I bought the truck...I've since installed a Lokar kickdown cable. Seems to be working fine. Only pulls the lever at WOT and does pull it down to second...PITA to set by yourself....2 man job makes it easier
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From: Northeast, OK
Kevin - Your issue is similar to what I had with a tranny that sat for several years before I put it in service. It would always shift into 1st if I pulled the lever to 1, but it didn't always go to first when I came to a stop. I read that it could be stuff that was flaking off in the valve body, so ran Sea Foam and it cleared up within 500 miles.
As for the engine, try using ported vacuum for your vacuum advance instead of manifold vacuum.
As for the engine, try using ported vacuum for your vacuum advance instead of manifold vacuum.
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From: Dallas, GA
Kevin - Your issue is similar to what I had with a tranny that sat for several years before I put it in service. It would always shift into 1st if I pulled the lever to 1, but it didn't always go to first when I came to a stop. I read that it could be stuff that was flaking off in the valve body, so ran Sea Foam and it cleared up within 500 miles.
As for the engine, try using ported vacuum for your vacuum advance instead of manifold vacuum.
As for the engine, try using ported vacuum for your vacuum advance instead of manifold vacuum.
I do have it connected to the ported vacuum on the Primary metering block...she just seems to like it advanced
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Joined: Nov 2009
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From: Broken Arrow , OK
The picture is indeed a servo. It is an "S" code servo at that.
Here is a pic of the Governor on a C6:
You have to pull the tail housing and it is pretty deep into it. You may be just having some sticky issues with the governor. You can take the truck out to an unpopulated stretch of road. Then throw it in Reverse and drive it like you stole it. This will back flush fluid through the governor if something is in it the obstruction should get flushed out.
The C6 only has one band. I havent been into an auto that had more than one band. I am not saying there isnt one made with more than one band, but , the C6, E4OD or 4L60E only have one band. 120 inch lbs or 10 ft lbs is the spec. Transgo has a different method of adjusting the band tension. I posted it here or on FSB at one time. If I run across it I will post it here.
Here is a pic of the Governor on a C6:
You have to pull the tail housing and it is pretty deep into it. You may be just having some sticky issues with the governor. You can take the truck out to an unpopulated stretch of road. Then throw it in Reverse and drive it like you stole it. This will back flush fluid through the governor if something is in it the obstruction should get flushed out.
The C6 only has one band. I havent been into an auto that had more than one band. I am not saying there isnt one made with more than one band, but , the C6, E4OD or 4L60E only have one band. 120 inch lbs or 10 ft lbs is the spec. Transgo has a different method of adjusting the band tension. I posted it here or on FSB at one time. If I run across it I will post it here.
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Joined: Jul 2010
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From: Northeast, OK
I'm thinking that Sea Foam's tranny stuff and the back up trick, combined, might help quite a bit. I really would bet that some varnish or something similar has come loose and is plugging a passage.
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Joined: Feb 2004
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From: Marengo, Iowa
Been a while since I was into a C6, was thinking the governor was side mounted.
Sea Foam Trans Tune is what you are looking for, good stuff.
One other thing I had thought of possible, is what vacuum is actually getting to the modulator valve. I have seen cases where the line to it was plugged in some form or another. Also, hook the vacuum going tot he trans into the manifold itself if at all possible. You don't want a ported vacuum, you want true engine vacuum.
Sea Foam Trans Tune is what you are looking for, good stuff.
One other thing I had thought of possible, is what vacuum is actually getting to the modulator valve. I have seen cases where the line to it was plugged in some form or another. Also, hook the vacuum going tot he trans into the manifold itself if at all possible. You don't want a ported vacuum, you want true engine vacuum.
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From: Dallas, GA
Well put a new modulator in and it didn't seem to help much. When I pulled it off, I put on a fresh peice of vacuum hose and sucked on it...seemed tight. Had a new one so I put it in while there. It's adjustable so I gave it a couple turns in the clockwise directions like the instructions said...no difference.
I did check to see if I was getting vacuum there with the engine running. Have a good vacuum source. replaced both sections of hose (at the manifold and tranny) while I was at it.
It did seem to make a difference on how it shifted...seems to shift better once it decides to shift, especially after I adjusted the modulator. But still shifts way too high RPM and at times don't seem like its ever going to unless I let off the throttle or manually shift it.
I think Sea Foam is my next step. Will be out of the country for a couple weeks so will pick up where I left off then.
btw....when you pull that modulator out, lots of tranny fluid comes with it...Duh You would think I would have known that
I did check to see if I was getting vacuum there with the engine running. Have a good vacuum source. replaced both sections of hose (at the manifold and tranny) while I was at it.
It did seem to make a difference on how it shifted...seems to shift better once it decides to shift, especially after I adjusted the modulator. But still shifts way too high RPM and at times don't seem like its ever going to unless I let off the throttle or manually shift it.
I think Sea Foam is my next step. Will be out of the country for a couple weeks so will pick up where I left off then.
btw....when you pull that modulator out, lots of tranny fluid comes with it...Duh
You would think I would have known that
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From: Northeast, OK
Sounds like the modulator helped, but that you still have a problem, so I think Sea Foam is the next step, like you said. Assuming your are flying out tomorrow, can you put the stuff in tonight or tomorrow morn and take it for a spin? That way the Sea Foam will have a chance to thin/dissolve whatever is in there while you are gone.
Where you headed?
Where you headed?
Thread Starter
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From: Dallas, GA
Sounds like the modulator helped, but that you still have a problem, so I think Sea Foam is the next step, like you said. Assuming your are flying out tomorrow, can you put the stuff in tonight or tomorrow morn and take it for a spin? That way the Sea Foam will have a chance to thin/dissolve whatever is in there while you are gone.
Where you headed?
Where you headed?
Heading over to one of our manufacturing facilities in France and then on to Dubai...have a team that works for me there so make that trip at least once a year. Not really looking forward to it this time to be honest....timing is bad
FTE Legend
Joined: Jul 2010
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From: Northeast, OK
actually not flying out until Monday night so will pick some up tomorrow and take it for a couple spins....throw her in reverse for a while too
Heading over to one of our manufacturing facilities in France and then on to Dubai...have a team that works for me there so make that trip at least once a year. Not really looking forward to it this time to be honest....timing is bad
Heading over to one of our manufacturing facilities in France and then on to Dubai...have a team that works for me there so make that trip at least once a year. Not really looking forward to it this time to be honest....timing is bad