C6 shifting early, how can it be changed

calvinstoy · Post by **calvinstoy** » Mon Jun 13, 2005 8:35 pm

I recently changed the intake to a 4 barrel and did a shift kit in the trans, now with the increased vacuum to the modulator, the trans shifts early. The modulator is not adjustable, can I put some sort of orifice in the vacuum line to cause the trans to shift later? I did a quick test with the valve I pulled off of the distributer (mine is "green", I understand that they are different colors for different delays in vacuum advance to the distributer) and it certainly helped. Any thoughts or suggestions would be appreciated.

ttyR2 · Post by **ttyR2** » Tue Jun 14, 2005 12:14 am

Vacuum modulators are also available for auto tranny's in an adjustable version.

calvinstoy · Post by **calvinstoy** » Tue Jun 14, 2005 9:17 pm

How hard are the modulators to replace?

67F250CS · Post by **67F250CS** » Tue Jun 14, 2005 10:53 pm

5 minute job with a pee break included.

calvinstoy · Post by **calvinstoy** » Wed Jun 15, 2005 8:33 pm

Your right, easy 5 minute job, however the first run the trans shifted at about 3000 rpm with my foot in it, so I turned the modulator screw in 1/4 turn and there was no change. Then i turned it out 1/2 turn no change. After much messing around with I got the thing so far out of wack it never shifted that high again even with the modulator screw all the way in. I bought another one just to give it a shot and it still wants to shift early. Does anyone know what the color band signifies on the modulator. Mine is a purple band push in regulator.

68F250 · Post by **68F250** » Wed Jun 15, 2005 8:49 pm

Here's a good thread on shift speeds: http://fordification.com/forum/viewtopic.php?t=1115

Try checking your shift speeds without flooring it which activates the kickdown linkage, try 3/4 throttle.

calvinstoy · Post by **calvinstoy** » Sat Jun 18, 2005 2:48 pm

What would happen if the modulator is disconnected from its vacuum source and the vacuum source was plugged? I know it will shift later and harder, but how much later? Harder is what I am after so that would be a plus.

67F250CS · Post by **67F250CS** » Sun Jun 19, 2005 11:55 am

Hey C.
check out his place. Your question can probably be answered here or it might have already been, if you are willing to scan some of the threads.
Hope this helps you.

http://www.network54.com/Forum/260730

calvinstoy · Post by **calvinstoy** » Wed Jun 22, 2005 9:17 pm

That site was very informative, I ended up putting a longer pin in the modulator. Now it shifts nice and hard at about 4k with you foot in it.

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C6 shifting early, how can it be changed

C6 shifting early, how can it be changed

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re: C6 shifting early, how can it be changed

re: C6 shifting early, how can it be changed

re: C6 shifting early, how can it be changed

re: C6 shifting early, how can it be changed

re: C6 shifting early, how can it be changed

re: C6 shifting early, how can it be changed

re: C6 shifting early, how can it be changed