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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

Tranny Modulator

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Old Feb 29, 2008 | 07:41 PM
  #1  
gilllawn's Avatar
gilllawn
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Tranny Modulator

My transmission shifts really weird. When I am going slow (under 15mph) the truck will not shift into second gear. Then it won't shift out of 2nd until you hit around 35. is this normal? I changed the vacuum modulator originally had a green stripe but I bought the black striped one with not much improvement. Does anyone have the process for adjusting the modulator?

Thanks

GILL
 
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Old Feb 29, 2008 | 09:06 PM
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Have you checked to make sure the vacuum line is in good shape? No leaks on breaks in the lines.
 
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Old Feb 29, 2008 | 09:24 PM
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supercharged 300
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have you check the tranny fluid?
is an auto right?
C6,a4ode,a4od,aod, what is it if its an auto?
 
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Old Feb 29, 2008 | 10:10 PM
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Your modulator should have come with an instruction sheet, which tells you which way to turn the little screw up in the vacuum nipple to change the shift points.
 
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Old Mar 1, 2008 | 07:46 AM
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Tranny fluid and filter was changed as well as the vacuum line which is brand new. No instruction sheet with the modulator
 
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Old Mar 1, 2008 | 10:23 PM
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Well, take a small screwdriver and stick it up in the vacuum nipple and see if it has an adjustment screw. Note where the screw is and turn it one turn and see what happens. If you go the wrong way turn it the other way.
 
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