GM Drivetrain & Suspension Chassis | Transmission| Driveshaft | Gears/Rear End/Differential | Traction Aids

how do u take off a vac mod?

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Old Feb 25, 2008 | 04:41 PM
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Default how do u take off a vac mod?

hey guys i was wondering how can i take off the vacum modulator i got. the reason for this is that im putting my tranny back to stock?? please help
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Old Feb 26, 2008 | 02:19 AM
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or what do i need to buy?
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Old Feb 26, 2008 | 03:54 AM
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My guess is you just do the opposite of putting it in and hook a Throttle cable back to the trans. But i'm not sure how these new trans are set up. Can't see why you would want to take it off tho. The vacuum Modulator works better than a cable and all your doing by putting your trans back to stock is making it weaker.
From what i've found, to put one in you Drill a hole in the tranmission case. Uninstall the force motor and install the vaccum modulator. (don't even need to drop valve body) Run the rubber hose from the vaccum mod to the fitting in the hole you drilled. Run the hose from the outside fitting and into the T fitting that you have intalled in your brake booster hose.
You'd obviously want to block the hole back off and reinstall the force motor (assuming it is really removed cuz i'm not sure if youd really remove it.)

you might want to pm Vince @ FLT he builds some stout transmissions and will know how to go back stock.

Last edited by viciousknid; Feb 26, 2008 at 04:05 AM.
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Old Feb 26, 2008 | 08:02 PM
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Well first you'll have to pull the pan off and remove the 1-2 accumulator housing. Then the vacuum modulator and sleeve will come out. Replace it with the factory Pressure Control Solenoid and retainer. Then remove the brass sleeve that is tapped into the case. Youll need to JB weld or Epoxy the whole... I think thats it
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Old Feb 27, 2008 | 12:50 PM
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thanx thats sounds better. between 1-10 how hard is it?
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Old Feb 28, 2008 | 07:22 AM
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Originally Posted by bostinchevy13
thanx thats sounds better. between 1-10 how hard is it?
With 10 being most difficult, I'd say 3... but that's b/c I've been in/out of transmissions for some time now.
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Old Feb 28, 2008 | 11:27 AM
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so thats a 9 for me
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Old Feb 28, 2008 | 11:41 AM
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Nah... The worst part is probably making sure the hole where the adapter's screwed in is sealed completely.
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