C6 Modulator Adjustment - Ford Truck Enthusiasts Forums

C6 Modulator Adjustment

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Old 06-10-2007, 09:50 PM
JSPajak JSPajak is offline
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C6 Modulator Adjustment

The previous owner of my 77 F-150 460/C6 2wd decided to adjust the modulator on the C6 transmission (newly rebuilt) to shift very quickly. At part throttle it's in 3rd at 20 MPH or less.

He did this in an ill-fated attempt to save gas.

I'd like to adjust it to more normal shift points at part throttle.

How do I do this?
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Old 06-10-2007, 11:01 PM
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53fatfndr 53fatfndr is offline
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Pull the vacuum line off of the modulator. When you look inside you should see a small slot that a screw driver will fit into. Use your flat screw driver and turn it clockwise to raise the shifting points, and counterclockwise for earlier shift points. From what you describe, you want clockwise turns. Don't turn it all the way in! Start with 1/4-1/2 circle turns, take it for a drive and see how you like it, and just fine tune it that way. Hope this helps.
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Old 06-11-2007, 04:13 PM
rclarke rclarke is offline
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Some modulators don't have the adjustment screw. If yours doesn't have it pull the modulator and make or buy a longer pin for behind the modulator. Longer pin = later shifts shorter pin = earlier shifts.
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