Vacuum Modulator Replacement

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Aug 2, 2016 | 09:32 PM

e30rik

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Cross-Country

Joined: Jun 2016

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Vacuum Modulator Replacement

So I replaced my transmission modulator the other day and I have a couple questions. First when I removed the old one ATF started pouring out like a drain plug, I just let it go till it stopped. At least a couple quarts came out. Is that normal? If not, how much should I buy to top off? More importantly, I'm not sure if I put it in right. I put the pin in the new one and pushed it into the hole and it snapped in and felt fine but I was able to push it in further but it kept popping back like a spring. I just pushed on it while tightening the bracket. Is that right or should I loosen it and let it sit where it wants? I haven't driven the truck yet because I need to buy atf and I want to make sure I didn't mess anything up by forcing the modulator in. any help appreciated, thanks

Aug 3, 2016 | 03:35 AM

FordFETruck

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Joined: Sep 2011

Posts: 4,491

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From: Algona,WA

Which trans? sounds like a c6 from what you described. I had to push mine in while tightening the clamp down, it should be fully seated against the transmission case. I had a lot of fluid come out when I took mine out too but I kept my finger over the hole to minimize how much came out. So, yes that's pretty normal.

Aug 3, 2016 | 05:56 AM

Franklin2

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Joined: Jan 2001

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From: Virginia

The tranny dipstick tells you how low you are on fluid. If it won't move when you go for a test ride, that is also an indicator you are really low.

If you messed the modulator up, it won't shift correctly.