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To replace the transmission vacuum modulator, you need to jack up the front passengers side of the car and support it on a jack stand. Before starting, apply the park brake fully.You will need a rag, an ice cream pail and a 1/4 inch drive rachet, with universal and 12 inches of extensions and a 10 mm socket to remove the modulator hold down clamp bolt which is slightly above the modulator valve.

Remove the Vacuum hose, remove the 10 mm bolt,catch the clamp, place drain pan(ice cream pail) under the modulator to catch tranny fluid if it drips. Wiggle the old leaking unit out of the bore and remove the small diameter shaft from the old unit.Insert the shaft into the new unit and carefully guide the new unit into the bore, wiggling it in all the way. Grab the hold down clamp in your hand, and place it in its position to hold down the modulator, this clamp goes one way and rests on the flange of the modulator to hold it in firmly. Install and tighten the bolt to approximately 15 foot pounds of torque, install the vacuum hose after blowing it out from the top, remove it from the vacuum tree by the brake booster(drivers side)and blow all the tranny fluid out, and if the hose is rubbery from being saturated in fluid, replace the top part which is about a foot long. Road test the vehicle, and if you have an adjustable unit, adjust the shift points to where you would like them by turning the Allen screw clockwise or counterclockwise. Good Luck.And don't forget to check the tranny fluid level!

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โˆ™ 2011-09-12 21:05:22
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Q: How do you replace the transmission modulator valve on a 1989 Ford Mustang 2.3 EFI?
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