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C4 Transmission not shifting down
I just installed a newly rebuilt C4 transmision in my 66 mustang and it is not shifting properly. When i put it in reverse it works fine, then the drive position it will shift up through the gears but you can not feel the shift. I am running open headers rigt now so its loud and hearing the shift is hard but i have had it up to 70 with very little gas pedal and low rpms so I assume its making it to third. When coasting for a while say uphill it should drop down to 2nd but seems to be in third. Get a rpm increase with no thrust. If i oull off the road and stop it seems to stay in 2nd. I can manually shift it just fine. I have checked the vaccum pressure at the modulator it is about 10-12 the pin in front of the modulator is 41mm long or 1.614 inches. this is the push in type modulator. I was told to screw the modulator adjustor all the way in and half a turn out , and it did seem to help a bit. Any other ideas out there???? Is the pin long enough??
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