Replacing the A4LD Vacuum Modulator - MustangForums.com



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Old 03-20-2008, 08:42 PM   #1
sleeper_inc
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Default Replacing the A4LD Vacuum Modulator



If your Modulator has failed (like mine) then when you take the vacuum line off transmission fluid will drip out (flow out)


Loosen the bolt (its 10MM) and take the bracket out


Old modulator on the right, new one of the left


This is the thin metal pin inside the modulator... DO NOT LOOSE THIS!!!! transfer over to the new modulator



Pictures of the only modulator



Picture of the new modulator


Bracket used to hold the modulator in place


Space were the modulator goes


New modulator in place with vacuum line hooked up

not so hard to do when the car is jacked up
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Old 03-20-2008, 09:32 PM   #2
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Default RE: Replacing the A4LD Vacuum Modulator

What are the symptoms of this failing? nice pics by the way!
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Old 03-20-2008, 09:39 PM   #3
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Default RE: Replacing the A4LD Vacuum Modulator

Later shifts, transmission fluid in the lines, and a wired burning smell (also bad shifts)
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Old 03-20-2008, 09:58 PM   #4
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Default RE: Replacing the A4LD Vacuum Modulator

cool, just asking for later viewers of this thread. It should be put in the tech articles.
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Old 03-20-2008, 10:07 PM   #5
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Default RE: Replacing the A4LD Vacuum Modulator

Already there

Don't have the contributor badge for nothing [8D]
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Old 03-21-2008, 05:03 AM   #6
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Default RE: Replacing the A4LD Vacuum Modulator

how much did it cost you for the new one? And where did you buy it at?
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Old 03-21-2008, 08:40 AM   #7
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Default RE: Replacing the A4LD Vacuum Modulator

$15, and I got mine from auto parts plus. Any store should carrie it
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Old 03-21-2008, 09:55 PM   #8
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Default RE: Replacing the A4LD Vacuum Modulator

checked mine today and it was leaking badly. So i replaced it and figured i would change the filter and fluid in the tranny also. Well come to find out my trans is out of a 90 mustang even though my mustang is a 91. Drove nearly clear across town to the parts store that had the 91 filter to find out it didnt fit F*** me. Should have double checked.

Sleeper does your new one have an adjustment screw on it?
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Old 03-22-2008, 06:43 AM   #9
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Default RE: Replacing the A4LD Vacuum Modulator

Yes it does, but thats because its the turbo one (highly recomend it since you can change your shift points with it)
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Old 03-22-2008, 07:35 PM   #10
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Default RE: Replacing the A4LD Vacuum Modulator

good thats the one i got glad to hear i can adjust my shift points now!!!!
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1966, 1992, 90, a4ld, amount, bad, fluid, length, modulator, mustang, pin, replacing, symptoms, transmission, vacuum

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