Shifting too fast

Shifting too fast

Joined: February 11th, 2009, 2:46 pm

April 26th, 2011, 5:00 pm #1

After rebuilding several C6's, I have the same issue with all of them. Once installed they shift very fast. I am seting all the tollerances to the low/tight side.
Reverse-high clutch is at .022-.03inch
Forward clutch .021-.03inch
Total end play is at .008-.015inch

Could these be too tight and be making the system shift extremely fast? Or is there something else I am looking for?

Thanx for your time and responses
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Joined: November 18th, 2004, 4:20 am

April 26th, 2011, 7:02 pm #2


Clearances won't affect shift timing.

You may have an incorrect or badly adjusted modulator valve.

Are you installing shift kits?
If a shift kit is installed quite often the modulator pin used is too short and will cause early shifts.
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Joined: February 11th, 2009, 2:46 pm

April 26th, 2011, 8:13 pm #3

I have played with the pin length and here are my results...
If I Increase the length of the pin, then the unit starts out in second and has a nice length between 2nd and 3rd gear but no 1st gear. If I shorten the pin by .02", then I have a very fast shift 1 2 3 then a lot of dragging out 3rd gear. I can not find a happy medium between the two yet.

Mike
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Joined: November 18th, 2004, 4:20 am

April 27th, 2011, 3:10 am #4

After rebuilding several C6's, I have the same issue with all of them. Once installed they shift very fast. I am seting all the tollerances to the low/tight side.
Reverse-high clutch is at .022-.03inch
Forward clutch .021-.03inch
Total end play is at .008-.015inch

Could these be too tight and be making the system shift extremely fast? Or is there something else I am looking for?

Thanx for your time and responses
You did not answer about a shift kit.


The problem lies in the valve body then.
Did you tighten the banana plate properly?
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Joined: February 11th, 2009, 2:46 pm

April 27th, 2011, 10:55 am #5

The band is torqued to 10ft lbs and backed off 1½ turnes and then sinched down. This unit does not have a shift kit installed. I have tried both ways, with and without and it has the same effect a verry fast 1-2-3 shift, Thanks for the response.
Mike
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Joined: November 18th, 2004, 4:20 am

April 27th, 2011, 12:13 pm #6

Ok. What about the banana plate?
How and when are you tightening it?
The way is to tighten it after the two halves have been assembled.

You may want to look into the governor circuit.
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