TH350-C tcc question? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chevyjr73 · 03-25-2004, 11:53 AM

whats up? i have a 1986 chevrolet c-10 1/2 ton truck and have a question regarding the vacuum source for the th350-c tcc vacuum switch by the brake booster. does the vacuum supposed to be manifold or ported and also its going through a thermal vacuum switch, should this only open when the temp is warm? right now it lets vacuum through when cold and shuts it off when hot. i have disconnected my egr bleed solenoid so i dont know if this is affecting it any. i have replaced the esc distributor with a old style vaccum advance and installed a edelbrock performer 600 carburetor.

Slonaker · 03-25-2004, 01:05 PM

I don't know how it is supposed to be routed, but I have the vacuum diagram saved as a GIF at home. I can post it if you think it would help.

My truck is an '86 C10 with a TH350C transmission.

Slonaker

rolson1039 · 03-25-2004, 01:37 PM

mine has a 4.3 v6 ( also a half ton 86) and the vacuum for the trans is on the manifold

Slonaker · 03-25-2004, 03:10 PM

Rolson1039:

Are you talking about the vacuum source for the modulator or the one for the switch that controls the torque convertor lockup? I think that is what he is asking about.

Slonaker

chevyjr73 · 03-25-2004, 05:09 PM

im talking about the switch that controls the lock up converter. its bolted on the firewall near the brake booster.

Slonaker · 03-26-2004, 04:21 PM

Send me an email if you need the copy of the vacuum diagram.

Slonaker

03-25-2004, 11:53 AM	#1
chevyjr73 Registered User Join Date: Mar 2004 Location: chesapeake,virginia Posts: 117	TH350-C tcc question? whats up? i have a 1986 chevrolet c-10 1/2 ton truck and have a question regarding the vacuum source for the th350-c tcc vacuum switch by the brake booster. does the vacuum supposed to be manifold or ported and also its going through a thermal vacuum switch, should this only open when the temp is warm? right now it lets vacuum through when cold and shuts it off when hot. i have disconnected my egr bleed solenoid so i dont know if this is affecting it any. i have replaced the esc distributor with a old style vaccum advance and installed a edelbrock performer 600 carburetor.

03-25-2004, 01:05 PM	#2
Slonaker Insert Witty Text Here Join Date: Oct 2002 Location: San Antonio, TX Posts: 3,415	I don't know how it is supposed to be routed, but I have the vacuum diagram saved as a GIF at home. I can post it if you think it would help. My truck is an '86 C10 with a TH350C transmission. Slonaker __________________ '86 Chevy C10 (Sold 04/19/13 ) Stock '01 Silverado

03-25-2004, 01:37 PM	#3
rolson1039 Registered User Join Date: Oct 2002 Location: NJ Posts: 404	mine has a 4.3 v6 ( also a half ton 86) and the vacuum for the trans is on the manifold __________________ so many trucks so little time!!!

03-25-2004, 03:10 PM	#4
Slonaker Insert Witty Text Here Join Date: Oct 2002 Location: San Antonio, TX Posts: 3,415	Rolson1039: Are you talking about the vacuum source for the modulator or the one for the switch that controls the torque convertor lockup? I think that is what he is asking about. Slonaker __________________ '86 Chevy C10 (Sold 04/19/13 ) Stock '01 Silverado

03-26-2004, 04:21 PM	#6
Slonaker Insert Witty Text Here Join Date: Oct 2002 Location: San Antonio, TX Posts: 3,415	Send me an email if you need the copy of the vacuum diagram. Slonaker __________________ '86 Chevy C10 (Sold 04/19/13 ) Stock '01 Silverado

03-25-2004, 05:09 PM	#5
chevyjr73 Registered User Join Date: Mar 2004 Location: chesapeake,virginia Posts: 117	im talking about the switch that controls the lock up converter. its bolted on the firewall near the brake booster.

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