Whats this????? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Zable49 · 01-11-2013, 09:21 PM

Well while I was getting ready to clean up the starter wiring. (FUN TIMES)

I noticed a sensor on the transmission that had nothing to it. (See attached) I looked around and couldn't find any wiring that would go to it. What is it for?

Thanks Everyone

kenbob87 · 01-11-2013, 09:23 PM

reverse light switch possibly?

Zable49 · 01-11-2013, 09:26 PM

Quote:

Originally Posted by kenbob87

reverse light switch possibly?

Dang, didn't even think about that. Could be why my lights dont work. Ummmmm

cdowns · 01-11-2013, 09:43 PM

if it is original tranny probally the TCS thingy that was an early polution control thingy that did not much in real life/// backup light switch was combined with NSS on the steering column

Beetle · 01-11-2013, 10:01 PM

What transmission? If I remember correctly, and may be wrong with this cause it may only be Corvettes but... is that maybe where the solenoid for the passing gear goes?

**Ironangel** · 01-11-2013, 10:13 PM

Quote:

Originally Posted by Beetle

What transmission? If I remember correctly, and may be wrong with this cause it may only be Corvettes but... is that maybe where the solenoid for the passing gear goes?

Correctamundo Beetle! That option was offered exclusively for the Corvettes and the elusive Factory COPO Trucks! You've single offhandedly discovered the "missing COPO link!"

Beetle · 01-11-2013, 10:17 PM

Quote:

Originally Posted by Ironangel

Correctamundo Beetle! That option was offered exclusively for the Corvettes and the elusive Factory COPO Trucks! You've single offhandedly discovered the "missing COPO link!"

Smart Ass

**TBONE1964** · 01-11-2013, 10:17 PM

Jason you are correct. It is the electric kick down for a 400 transmission. If truck came factory with a 400, there should be a switch on the top of the gas peddle inside the cab.

Beetle · 01-11-2013, 10:18 PM

Quote:

Originally Posted by TBONE1964

Jason you are correct. It is the electric kick down for a 400 transmission. If truck came factory with a 400, there should be a switch on the top of the gas peddle inside the cab.

Yea see thats what I was wondering, did these trucks have a similar setup as the Vettes and Camaros. I think my question was answered, so yea it should be that kickdown solenoid and its only like $20 at a parts store

**JDL** · 01-11-2013, 10:27 PM

Quote:

Originally Posted by cdowns

if it is original tranny probally the TCS thingy that was an early polution control thingy that did not much in real life/// backup light switch was combined with NSS on the steering column

I agree with cdowns my truck had the tsc I took the sensor out becouse it leked still have the wires tied back.

71K20chevy · 01-12-2013, 12:29 AM

My Turbo 350 has the same thing though...

ls1nova71 · 01-12-2013, 02:02 AM

It's for the TCS (transmission controlled spark), it also used a couple of relays on the firewall and a solenoid on the intake that had the vacuum advance hose run through it so it could adjust the amount of advance in high gear. As said earlier, it probably didn't work real well when new, and even less now days.

sjarrett71 · 01-12-2013, 10:22 AM

Quote:

Originally Posted by ls1nova71

It's for the TCS (transmission controlled spark), it also used a couple of relays on the firewall and a solenoid on the intake that had the vacuum advance hose run through it so it could adjust the amount of advance in high gear. As said earlier, it probably didn't work real well when new, and even less now days.

Agreed! The kickdown for a TH400 is on the driver's side and has a 2 blade connector. There is an awesome book out there called the Chevrolet Service Manual and in the 1972 version it describes the TCS system (with photos) starting on page 253. A link to the manual is in this thread:

http://www.67-72chevytrucks.com/vboa...d.php?t=558016

Zable49 · 01-13-2013, 12:11 AM

Cool, thanks guys. I think I will just remove it and block it off so I dont run the chance of it leaking down the line.

01-11-2013, 09:21 PM	#1
Zable49 Registered User Join Date: Jun 2007 Location: Lacey, Wa Posts: 181	Whats this????? Well while I was getting ready to clean up the starter wiring. (FUN TIMES) I noticed a sensor on the transmission that had nothing to it. (See attached) I looked around and couldn't find any wiring that would go to it. What is it for? Thanks Everyone Attached Images Last edited by Zable49; 01-11-2013 at 09:44 PM.

01-11-2013, 09:23 PM	#2
kenbob87 Registered User Join Date: Oct 2012 Location: South Haven, MN Posts: 109	Re: Whats this????? reverse light switch possibly?

01-11-2013, 09:43 PM	#4
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Whats this????? if it is original tranny probally the TCS thingy that was an early polution control thingy that did not much in real life/// backup light switch was combined with NSS on the steering column __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

01-11-2013, 10:01 PM	#5
Beetle Registered User Join Date: May 2009 Location: Fayetteville, NC Posts: 725	Re: Whats this????? What transmission? If I remember correctly, and may be wrong with this cause it may only be Corvettes but... is that maybe where the solenoid for the passing gear goes? __________________ Jason TEAM C10 HOT ROD POWER TOUR 689 Short Step 68 Step Trucks Sold: 70 GMC, 72 K5 Members met: Andy4639 GCncsuHD CSGAS zicc1835 hotrod farm truck Mingrao Bhelton brenthiggins

01-11-2013, 10:17 PM	#8
TBONE1964 Cluster King Join Date: Nov 2012 Location: Junction City, OR Posts: 5,263	Re: Whats this????? Jason you are correct. It is the electric kick down for a 400 transmission. If truck came factory with a 400, there should be a switch on the top of the gas peddle inside the cab.

01-12-2013, 12:29 AM	#11
71K20chevy Registered User Join Date: Jul 2012 Location: Ft Wayne Indiana Posts: 1,204	Re: Whats this????? My Turbo 350 has the same thing though... __________________ 71 K20 64 GMC mud truck

01-12-2013, 02:02 AM	#12
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,119	Re: Whats this????? It's for the TCS (transmission controlled spark), it also used a couple of relays on the firewall and a solenoid on the intake that had the vacuum advance hose run through it so it could adjust the amount of advance in high gear. As said earlier, it probably didn't work real well when new, and even less now days. __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

01-13-2013, 12:11 AM	#14
Zable49 Registered User Join Date: Jun 2007 Location: Lacey, Wa Posts: 181	Re: Whats this????? Cool, thanks guys. I think I will just remove it and block it off so I dont run the chance of it leaking down the line.



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