c6 tranny vacuum modulator

Clutch, transmission, rear axle

Moderators: FORDification, 70_F100

Post Reply
User avatar
Timd
New Member
New Member
Posts: 68
Joined: Thu Dec 08, 2016 11:42 pm
Location: Las Vegas

c6 tranny vacuum modulator

Post by Timd »

So I pulled my vacuum modulator and almost all my fluid drained out the hole, I don't believe this is normal? there was also some fluid in my modulator, is this normal?

Thanks
1969 Ford F100 Custom Cab
302
User avatar
windhamdw
New Member
New Member
Posts: 84
Joined: Wed Nov 25, 2015 2:39 pm
Location: Columbia, TN

Re: c6 tranny vacuum modulator

Post by windhamdw »

i pulled the vacuum line off mine a few weeks ago and i had no fluid come, if that helps.
User avatar
Timd
New Member
New Member
Posts: 68
Joined: Thu Dec 08, 2016 11:42 pm
Location: Las Vegas

Re: c6 tranny vacuum modulator

Post by Timd »

Thanks

Did you have the truck lifted at an angle?
1969 Ford F100 Custom Cab
302
User avatar
windhamdw
New Member
New Member
Posts: 84
Joined: Wed Nov 25, 2015 2:39 pm
Location: Columbia, TN

Re: c6 tranny vacuum modulator

Post by windhamdw »

no, it was setting on all four wheels.
User avatar
colnago
100% FORDified!
100% FORDified!
Posts: 1882
Joined: Tue Jun 14, 2011 8:48 pm
Location: Ridgecrest, CA

Re: c6 tranny vacuum modulator

Post by colnago »

I had to pull my modulator off last fall. The tranny slowly dripped fluid out, but I doubt if it lost 1/4 cup over an hour. It was parked in my driveway, so at a slight incline. I don't remember if there was any fluid in the modulator itself.

Joseph

On edit, there was also a plunger of some sort inside the tranny, behind the modulator. While I had the modulator off, this plunger tried to "creep" out of the hole. Could you be missing this plunger, and that's why it drained the tranny of all its fluid?
Last edited by colnago on Tue Feb 21, 2017 2:47 pm, edited 1 time in total.
"Sugar", my 1967 Ford F250 2WD Camper Special, 352FE, Ford iron "T" Intake with 1405 Edelbrock, Duraspark II Ignition, C6 transmission, front disc brake conversion.
Busboy
Blue Oval Fanatic
Blue Oval Fanatic
Posts: 943
Joined: Sat Jan 24, 2015 9:51 am
Location: Nampa Idaho

Re: c6 tranny vacuum modulator

Post by Busboy »

If you have fluid leaking out of the modulator vacuum nipple then it is time for a new modulator.
1967 F-100 4x4 custom cab.
Another 67 F-100 4x4 custom cab.
2016 F-150 Eco-Boost 2.7 liter. (It will smoke the tires!)
1972 F-350 Sport Custom cab & chassis.
1972 F-250 Explorer Special, Camper Special.
1971 F-100 custom. 302, C-4, p.s. p.b. factory 65 amp alternator with transistorized voltage regulator.
Post Reply