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05-10-2011, 06:10 PM
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#1 |
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Registered User
 
Join Date: Feb 2006
Location: weatherford ok.
Posts: 255
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Question about trans vac modulator
Hey guys, does anyone know if a bad vacume mod on a th 400 trans would cause my trans to only have park and 1st? no matter where i shift to it's 1st. already unhooked the linkage and shifted it at the trans output shaft to eliminate column and linkage, same thing no reverse or neutral. and checked the vac lines from the mod to the intake seem to be fine. could it be the modulator causing this?
__________________
71 chevy cheyenne lwb  http://s321.photobucket.com/albums/n..._tab_my_albums Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote! 
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05-10-2011, 08:12 PM
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#2 |
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Registered User
Join Date: Mar 2008
Location: Powhatan, Va.
Posts: 376
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Re: Question about trans vac modulator
You will usually have 1st and reverse, the trans just won't shift without the modulator working.
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05-10-2011, 10:53 PM
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#3 |
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Registered User
Join Date: Jan 2011
Location: Prescott AZ
Posts: 112
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Re: Question about trans vac modulator
Sound like you may have a valve hanging up in the valve body. Does it feel like it's engaging reverse and drive at the same time by chance?
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05-11-2011, 07:37 AM
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#4 |
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Registered User
Join Date: Feb 2006
Location: weatherford ok.
Posts: 255
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Re: Question about trans vac modulator
not so much reverse and drive but does seem like its in neutral till you give it some gas then drive! damn just my luck, i know nothing about transmissions. expensive to fix? thanks for the help guys. i do appreciate it.
__________________
71 chevy cheyenne lwb http://s321.photobucket.com/albums/n..._tab_my_albums Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote!
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