Transmission Vacuum Line hook up - The 1947 - Present Chevrolet & GMC Truck Message Board Network

zimmm · 08-30-2005, 05:06 PM

Hi new to the board and am in need of some information..... imagine that...

72 K20 - 350/350

Where should the vacuum line to the transmission be connected to the motor/carb?

It has an edelbrock carb on it with 3 ports on it. Currently two of the three are used - 1 to oil breather, 1 to dist. vac advance & 3rd is plugged.

I bought the truck recently and this line was not connected and no open connectors that I can see.

thanks

Mike Z

paintpyro · 08-30-2005, 05:43 PM

Welcome to the board. If you look on the back of the carb by the base, there is a port there.

dwaite72lnghrn · 08-30-2005, 08:11 PM

If it is a stock intake behind the carb is a tap on the intake where the vacuum canister runs. There is normally a "T" for it there. If you have power brakes the back hole is used. The trans is looking for full vacuum, So front-back bottom hole or the driverside front pipe.

Sorry almost forgot to say WELCOME to the board.

JimKshortstep4x4 · 08-30-2005, 08:30 PM

Here is a pic of the vacuum line hookup, (I made the line but it is similiar to the factory line). The open end of the tee is for the vacuum line to the brake booster.

Jim

zimmm · 08-31-2005, 01:34 AM

Thanks for all the help. will have to add a T on the manifold, as the vac hose for the brake booster connected there.

08-30-2005, 05:06 PM	#1
zimmm Registered User Join Date: Aug 2005 Location: Pittsfield, PA Posts: 34	Transmission Vacuum Line hook up Hi new to the board and am in need of some information..... imagine that... 72 K20 - 350/350 Where should the vacuum line to the transmission be connected to the motor/carb? It has an edelbrock carb on it with 3 ports on it. Currently two of the three are used - 1 to oil breather, 1 to dist. vac advance & 3rd is plugged. I bought the truck recently and this line was not connected and no open connectors that I can see. thanks Mike Z __________________ 72 K20 - quote upon getting it home "What did you buy it for if the brakes don't work" 98 Z71, 96 Tacoma + more toys than I can remember

08-30-2005, 05:43 PM	#2
paintpyro Registered User Join Date: Aug 2001 Location: Santa Fe Springs, CA,USA Posts: 1,579	Welcome to the board. If you look on the back of the carb by the base, there is a port there. __________________ 70 shortbed stepside "Schleprock" 350 w/TH400 rallys and BFGs -We can rebuild it, we have the technology-lower,shinier,faster

08-30-2005, 08:11 PM	#3
dwaite72lnghrn Registered User Join Date: Jun 2002 Location: central pa Posts: 1,525	If it is a stock intake behind the carb is a tap on the intake where the vacuum canister runs. There is normally a "T" for it there. If you have power brakes the back hole is used. The trans is looking for full vacuum, So front-back bottom hole or the driverside front pipe. Sorry almost forgot to say WELCOME to the board. __________________ 72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne Last edited by dwaite72lnghrn; 08-30-2005 at 08:13 PM. Reason: OOPS

08-30-2005, 08:30 PM	#4
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Here is a pic of the vacuum line hookup, (I made the line but it is similiar to the factory line). The open end of the tee is for the vacuum line to the brake booster. Jim Attached Images Last edited by JimKshortstep4x4; 08-30-2005 at 08:37 PM. Reason: Posted wrong pic!

08-31-2005, 01:34 AM	#5
zimmm Registered User Join Date: Aug 2005 Location: Pittsfield, PA Posts: 34	Thanks for all the help. will have to add a T on the manifold, as the vac hose for the brake booster connected there. __________________ 72 K20 - quote upon getting it home "What did you buy it for if the brakes don't work" 98 Z71, 96 Tacoma + more toys than I can remember



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