C6 shift points?
Laughing Gas
Joined: Jun 2003
Posts: 1,166
Likes: 0
From: Chino, California
The shift points change on engine demand. Less demand upshifts earlier, heavy demand shifts later.
Be more specific, and we can give you better info.
There is no set or specific answer.
Be more specific, and we can give you better info.
There is no set or specific answer.
Senior User
Joined: Jun 2005
Posts: 225
Likes: 0
You can also adjust this by turning the screw inside the vaccum modulator. Pull the vaccum hose off the back, and there is a tiny screw inside. Turn this screw inward and it will make you shift later and harder, and also kickdown sooner. Turn the screw outward and it will shift softer and sooner, and kickdown later. I just rebuilt my C6 and had to adjust this screw quit a bit to get it right, but you should only have to turn a little at a time if its pretty close to what you want.
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Senior User
Joined: Feb 2006
Posts: 479
Likes: 0
From: Sonoma, CA
Well since it's a new truck to me I am just trying to get it figured out and get used to what is normal. Yesterday after a tune up and test drive, under hard load it never seemed to get into high gear but I only got it up to about 60 mph from a dead stop. Does this sound normal? Shifting seems smooth. I am just trying to get a feel for how this C6 behaves.
Thanks
Thanks
Laughing Gas
Joined: Jun 2003
Posts: 1,166
Likes: 0
From: Chino, California
Were you still accellerating? If so. it may not have yet reached the demand point to shift. The C-6 is without a doubt the best automatic in its day. I recommend a TransGo Tow N' Go shift kit. It will add thousands of miles to the life of the tranny.
With the shift kit installed, remove the vacuum modulator with the metal push pin inside it and put it on a kitchen scale with the modulator vertical and the pin inside it pressing on the scale's platform. Keep adjusting that screw in the back kc7smo referred to until you get the modulator to click at eleven pounds pressure on the scale. That will give you excellent shifting points.
Some model years did not have adjustable vacuum modulators, but I think that was well after your model year. In the event it is not adjustable, just buy one that is, the work well. I believe you want the one with the white bad around the body of the modulator.
With the shift kit installed, remove the vacuum modulator with the metal push pin inside it and put it on a kitchen scale with the modulator vertical and the pin inside it pressing on the scale's platform. Keep adjusting that screw in the back kc7smo referred to until you get the modulator to click at eleven pounds pressure on the scale. That will give you excellent shifting points.
Some model years did not have adjustable vacuum modulators, but I think that was well after your model year. In the event it is not adjustable, just buy one that is, the work well. I believe you want the one with the white bad around the body of the modulator.
Cargo Master
Joined: May 2003
Posts: 2,561
Likes: 1
From: Earth
Originally Posted by pops_91710
Were you still accellerating? If so. it may not have yet reached the demand point to shift. The C-6 is without a doubt the best automatic in its day. I recommend a TransGo Tow N' Go shift kit. It will add thousands of miles to the life of the tranny.
With the shift kit installed, remove the vacuum modulator with the metal push pin inside it and put it on a kitchen scale with the modulator vertical and the pin inside it pressing on the scale's platform. Keep adjusting that screw in the back kc7smo referred to until you get the modulator to click at eleven pounds pressure on the scale. That will give you excellent shifting points.
Some model years did not have adjustable vacuum modulators, but I think that was well after your model year. In the event it is not adjustable, just buy one that is, the work well. I believe you want the one with the white bad around the body of the modulator.
With the shift kit installed, remove the vacuum modulator with the metal push pin inside it and put it on a kitchen scale with the modulator vertical and the pin inside it pressing on the scale's platform. Keep adjusting that screw in the back kc7smo referred to until you get the modulator to click at eleven pounds pressure on the scale. That will give you excellent shifting points.
Some model years did not have adjustable vacuum modulators, but I think that was well after your model year. In the event it is not adjustable, just buy one that is, the work well. I believe you want the one with the white bad around the body of the modulator.
