What are these? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

kenm78 · 03-02-2010, 06:49 PM

I'm trying to figure out what these two switches are for?? The first picture is of the switch on the passenger side of the engine fire wall. The secound one is on the drivers side of the fire wall. and the third pic is of the whole scene. I think the drivers side is for the torque converter lock up?? No idea what the passenger side is. Any one know what they are?

baggedcten · 03-02-2010, 06:56 PM

i dont know!
I want to know too!
There not even connected on my truck

D-Day · 03-02-2010, 07:51 PM

Windshield washer motor? Cruise control module?

b454rat · 03-02-2010, 08:07 PM

Lockup torque converter.

camshaftgsxr · 03-02-2010, 08:10 PM

EDIT: i started typing before b454rat's post was up so consider my post null

OP:am i correct in assuming that its a VACUUM TO ELECTRICAL "device" of some sort I can't really tell from the pictures. If so they clearly arent hooked up and you drive the truck every day so..

1. does something not work

or

2. you just wanna know.

my silverado had cruise control and there are no holes for that device in the firewall so i don't >>think<< its that.

if its for a lock up converter then why are there two?

gchemist · 03-02-2010, 08:30 PM

Picture one: ECM switch for timing.
Picture two: lockup torque converter switch.

kenm78 · 03-02-2010, 08:31 PM

Quote:

Originally Posted by b454rat

Lockup torque converter.

Both of them? or just the drivers side?

kenm78 · 03-02-2010, 08:32 PM

Quote:

Originally Posted by gchemist

Picture one: ECM switch for timing.
Picture two: lockup torque converter switch.

10-4... The silverado badge does say spark control of some sort. Thanks. Well the torque converter lock up isn't working figures.

b454rat · 03-02-2010, 08:55 PM

Forgot bout that spark thing. My 84 had both of them, thought they both were for the tranny.

datguysaL · 03-02-2010, 09:40 PM

ha, hey that looks exactly like the firewall on my 85, its got the exact same switches, the first switch had a vacuum hose running to it before i did away with pollution pump and all the extra hoses. the second switch.. .i think is for cruise control...

i was told the first switch has something to do with spark control and also told it had something to do with my carburator, cuz the original carb had a electrical connection on the top part above the choke.

but i have noticed that a difference in my transmission, but i dunno if has to do with that.

bitchin85 · 03-02-2010, 11:20 PM

i have a lockup convertor on my truck but that switch was broken so i took it off,not knowing what it was. can i buy a new one at the local auto parts place? does it hook up to a full vacuum? what about the wires? do the wires coming out of the trans hook into that? and if i do all this and hok it al up, will i notice any differance at all with performance or mpg? thanks and sorry if this sounds ignorant

Desert1957 · 03-02-2010, 11:28 PM

They are for the Lock-up part of your torque convertor, This is how they are supposed to work. Manifold vacum to the single port on the end. When the switch has full vacum at speed (4th gear) in and 700R4 it locks up the convertor for a 1 to 1 . Gas mileage helper. 2 wires go down to the plug on the right side of your tranny , near the pan. Go into the valve body.

Note: Most transmission guys will tell you if you let an overdrive run around for long a period of time with the convertor not locking up , The fluid temps will go way up. ( my 2 cents ) if you have it , hook it up and use it.

Desert

bitchin85 · 03-02-2010, 11:30 PM

i have a lockup trans i just dont have the wires hooked to anything... and i didnt know that till now..... is it badon the tranny?

datguysaL · 03-03-2010, 07:56 PM

since i have the exact same switched on my firewall,
where should i hook them up too?

the passanger side switch?? should go to what?

the driver side switch, the switch with the wires that go into the right side of the transmission should be hooked up to any vacuum port from the intake?
the port behind the carb?
the port in front of the carb?

03-02-2010, 06:49 PM	#1
kenm78 Broken Down Join Date: Dec 2006 Location: Choctaw, Oklahoma Posts: 1,267	What are these? I'm trying to figure out what these two switches are for?? The first picture is of the switch on the passenger side of the engine fire wall. The secound one is on the drivers side of the fire wall. and the third pic is of the whole scene. I think the drivers side is for the torque converter lock up?? No idea what the passenger side is. Any one know what they are? Attached Images __________________ kenm78 1982 Chevy 4X4 Project truck “It’s better to keep your mouth shut and let people wonder about your ignorance, than open your mouth and reveal all doubt”

03-02-2010, 06:56 PM	#2
baggedcten 86 C10 Join Date: Sep 2007 Location: Ga. Posts: 416	Re: What are these? i dont know! I want to know too! There not even connected on my truck __________________ 1986 C10 2001 chevy silverado purchased 8-29-09 sold 2004 silverado purchased 8-27-10 sold

03-02-2010, 07:51 PM	#3
D-Day Live fast, die young Join Date: Sep 2006 Location: Northwest Ohio Posts: 293	Re: What are these? Windshield washer motor? Cruise control module?

03-02-2010, 08:07 PM	#4
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,460	Re: What are these? Lockup torque converter. __________________ 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 6” lift 1999 GMC Yukon 350/4L60 4" SAS

03-02-2010, 08:10 PM	#5
camshaftgsxr Registered User Join Date: Feb 2010 Location: Asheville, N.C. Posts: 785	Re: What are these? EDIT: i started typing before b454rat's post was up so consider my post null OP:am i correct in assuming that its a VACUUM TO ELECTRICAL "device" of some sort I can't really tell from the pictures. If so they clearly arent hooked up and you drive the truck every day so.. 1. does something not work or 2. you just wanna know. my silverado had cruise control and there are no holes for that device in the firewall so i don't >>think<< its that. if its for a lock up converter then why are there two? __________________ Last edited by camshaftgsxr; 03-02-2010 at 08:12 PM.

03-02-2010, 08:30 PM	#6
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Re: What are these? Picture one: ECM switch for timing. Picture two: lockup torque converter switch. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

03-02-2010, 08:55 PM	#9
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,460	Re: What are these? Forgot bout that spark thing. My 84 had both of them, thought they both were for the tranny. __________________ 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 6” lift 1999 GMC Yukon 350/4L60 4" SAS

03-02-2010, 09:40 PM	#10
datguysaL Registered User Join Date: May 2009 Location: Houston, TX Posts: 155	Re: What are these? ha, hey that looks exactly like the firewall on my 85, its got the exact same switches, the first switch had a vacuum hose running to it before i did away with pollution pump and all the extra hoses. the second switch.. .i think is for cruise control... i was told the first switch has something to do with spark control and also told it had something to do with my carburator, cuz the original carb had a electrical connection on the top part above the choke. but i have noticed that a difference in my transmission, but i dunno if has to do with that.

03-02-2010, 11:20 PM	#11
bitchin85 Registered User Join Date: Aug 2009 Location: Lambertville MI Posts: 962	Re: What are these? i have a lockup convertor on my truck but that switch was broken so i took it off,not knowing what it was. can i buy a new one at the local auto parts place? does it hook up to a full vacuum? what about the wires? do the wires coming out of the trans hook into that? and if i do all this and hok it al up, will i notice any differance at all with performance or mpg? thanks and sorry if this sounds ignorant __________________ "I'll keep my guns, money, and freedom. You can keep the "change"

03-02-2010, 11:28 PM	#12
Desert1957 Registered User Join Date: Apr 2009 Location: New Freedom Pa. Posts: 1,335	Re: What are these? They are for the Lock-up part of your torque convertor, This is how they are supposed to work. Manifold vacum to the single port on the end. When the switch has full vacum at speed (4th gear) in and 700R4 it locks up the convertor for a 1 to 1 . Gas mileage helper. 2 wires go down to the plug on the right side of your tranny , near the pan. Go into the valve body. Note: Most transmission guys will tell you if you let an overdrive run around for long a period of time with the convertor not locking up , The fluid temps will go way up. ( my 2 cents ) if you have it , hook it up and use it. Desert Last edited by Desert1957; 03-02-2010 at 11:29 PM.

03-02-2010, 11:30 PM	#13
bitchin85 Registered User Join Date: Aug 2009 Location: Lambertville MI Posts: 962	Re: What are these? i have a lockup trans i just dont have the wires hooked to anything... and i didnt know that till now..... is it badon the tranny? __________________ "I'll keep my guns, money, and freedom. You can keep the "change"

03-03-2010, 07:56 PM	#14
datguysaL Registered User Join Date: May 2009 Location: Houston, TX Posts: 155	Re: What are these? since i have the exact same switched on my firewall, where should i hook them up too? the passanger side switch?? should go to what? the driver side switch, the switch with the wires that go into the right side of the transmission should be hooked up to any vacuum port from the intake? the port behind the carb? the port in front of the carb?



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