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Shifting no vacuum

1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Shifting no vacuum

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Old

Mar 10, 2012 | 03:09 AM

#1

diablodude64

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Joined: Feb 2012

Posts: 91

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Shifting no vacuum

I have been trying to diagnose my shifting issues on my 87 f250 6.9. It has a c6 and basically when i'm driving normal it won't shift with out nearly hitting redline. So, I pulled the vacuum hose at the modulator and while idling, it has no vacuum there.

What should I check?

Thanks, Kyle

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Old

Mar 10, 2012 | 07:55 AM

#2

subford

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Joined: Aug 2005

Posts: 23,667

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From: Easton,Ks

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Sorry I did not notice it was a Diesel.

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Old

Mar 10, 2012 | 07:56 AM

#3

bashby

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Joined: Nov 2005

Posts: 7,437

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From: Charles Town, W bygod Va

Does your power brake assist work? If not you probably need a vaccum pump. If it does follow the lines around that that go to the modulator looking for leaks.

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