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#1 |
aka TEX-TOY
Join Date: Jan 2007
Location: Kentucky
Posts: 127
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Transmission Vacuum?
Where does the transmission (th350 i think) vacuum line go to on a holley street avenger carb? Does it draw full vacuum?
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1969 Chevy C10 SWB w/ disk brakes and soon to be lowered with spindles and springs!!!! Getting a paint job like a Army Chinook Helicopter!!!! HOOKERS RULE!! ![]() BRAND NEW WIFE BOUGHT IT FOR ME AS A WEDDING GIFT!!! SHE IS THE BOMB!!!!!! ![]() |
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#2 |
Registered User
Join Date: Dec 2006
Location: New Mexico
Posts: 88
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Re: Transmission Vacuum?
I ran mine to manifold vaccuum while I still had it, so I'd say it does pull full vaccuum. You may be running your brake vaccum back just behind the carb on the manifold, and if you are, thats exactly where my vaccuum line to the modulator on the tranny went to. Justin
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'72 C/10 SWB 355/ broken TH350 and 3.07s ![]() ![]() |
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#3 |
Account Suspended
Join Date: Sep 2005
Location: Monroe, WA
Posts: 3,815
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Re: Transmission Vacuum?
Vacuum modulator should connect to manifold vacuum - either from unported vacuum on the carb or a fitting directly on the manifold.
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#4 |
aka TEX-TOY
Join Date: Jan 2007
Location: Kentucky
Posts: 127
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Re: Transmission Vacuum?
what does the modulator do anyway?
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1969 Chevy C10 SWB w/ disk brakes and soon to be lowered with spindles and springs!!!! Getting a paint job like a Army Chinook Helicopter!!!! HOOKERS RULE!! ![]() BRAND NEW WIFE BOUGHT IT FOR ME AS A WEDDING GIFT!!! SHE IS THE BOMB!!!!!! ![]() |
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#5 |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
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Re: Transmission Vacuum?
you had to ask.
http://yarchive.net/car/transmission.html
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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#6 |
Registered User
Join Date: Dec 2006
Location: New Mexico
Posts: 88
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Re: Transmission Vacuum?
I know it cushions shifts, not sure about anything else. Justin
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'72 C/10 SWB 355/ broken TH350 and 3.07s ![]() ![]() |
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#7 |
Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Re: Transmission Vacuum?
Shifts trans at part throttle and smooths the shifts. Governor controls shifts at full throttle. To see what I am talking about, take the vacumn line off (plug both ends) and shift trans into a gear. It will be a big thump. Also if modulator is bad, it will not shift into high gear at part tthrottle until you let off the gas. (the above advice comes with no warrenty implied or otherwise
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer Last edited by jhow66; 05-24-2007 at 10:35 PM. |
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#8 |
Registered User
Join Date: May 2011
Location: CHICAGO, IL.
Posts: 50
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Re: Transmission Vacuum?
is it possible to draw trans fluid into the intake from the vacuum line?
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#9 |
Registered User
Join Date: May 2008
Location: Mesa, AZ
Posts: 281
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Re: Transmission Vacuum?
My understanding of an automatic transmission is that both the governor AND the modulator control when the transmission shifts and into which gear. Just think of how you control a manual transmission.
Higher speeds require higher gears, however, higher loads require lower gears. If I'm missing anything, I'm sure others will chime in. But I don't think the modulators job is to simply smooth shifts, I just think without it the transmission isn't getting all the information needed to do it's job correctly. |
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#10 |
Watch out for your cornhole !
![]() Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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Re: Transmission Vacuum?
Yes, if the diaphram inside the modulator is leaking, it will allow engine vacuum to draw fluid out through the line and into the engine where it gets burned. A new modulator will fix this.
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#11 |
Registered User
Join Date: May 2011
Location: CHICAGO, IL.
Posts: 50
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Re: Transmission Vacuum?
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#12 | |
Registered User
Join Date: Oct 2010
Location: Largo Florida
Posts: 632
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Re: Transmission Vacuum?
Quote:
Goes to manifold vacuum always.
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Lifes journey is not to arrive at the gate well preserved, it is to slide in sideways all used up and wore out yelling.....God what'a ride! Where patience fails, force prevails Stapp's Ironical Paradox "The universal aptitude for ineptitude makes any human accomplishment an incredible miracle." |
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