Some electrical question in a new truck - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Srubydo1986 · 03-19-2010, 08:49 PM

OK i want to put a 700r4 in my other truck but most i seen have the tbi engine. but now i got one with a carb and 700r4 in it. But the line going from trans to engine have a few lines some go over brake booster and into fire wall near connection block no problem trace and use but i do have one the makes no cents what its for.

I have two pics one of wire and one of clip can you tell me were she goes pics would be great

and clip

thanks for looking

SSC's76 · 03-20-2010, 08:59 AM

Looks like a lockup switch connector for the tq converter going to no where. Is it plugged into the connection on the drivers side of the transmission? If it is that is what it for. I found this link a while back kept it bookmarked just for the part numbers. Might be help full. http://www.73-87.com/7387garage/drivetrain/lockup.htm

Srubydo1986 · 03-20-2010, 09:23 AM

well it does go to trans on other end but this does connect to the trans directly it looks to plug into something up top that would have the trans do something. but all the emission stuff was removed prior to me so i just want to know if its emission relation for trans, or if it will effect the trans in any way. maybe a cruise control option not being used.

SSC's76 · 03-20-2010, 11:59 AM

Quote:

Originally Posted by Srubydo1986

well it does go to trans on other end but this does connect to the trans directly it looks to plug into something up top that would have the trans do something. but all the emission stuff was removed prior to me so i just want to know if its emission relation for trans, or if it will effect the trans in any way. maybe a cruise control option not being used.

To be honest I dont know... There should only be one electrical connection on a 700R4 and thats the connector on the drivers side and its a square plug. I know of no cruise control that would be mounted on the trans doesnt mean there isnt one like that out there but you should see a box with the speedo cable going in and out if there is.

Srubydo1986 · 03-20-2010, 07:33 PM

I'm really sorry i must not be explaining right. (it the other end to the trans side it hooks to trans then to ...... )

I'm might think its a vacuum control modular for the truck so the lock up works in the trans. but this is only a guess after looking at the vacuum diagram in the rad support but that has been changed once but does say 1986 models on sticker.

so please anyone out there with a stock 700r4 truck that is originally carb equipped. please fallow the trans electric line from trans and tell me were it goes from there so i don't burn this trans up

HOGDADDY · 03-20-2010, 08:47 PM

Ok if this helps, I have one on my 86 truck and it came stock with a lock-up
Th350C and I believe it was originally connected to a vacuum switch that wouldn't allow lock-up til transmission (or engine possibly) was at normal operating temp.

I since have installed a 700r4 and don't use this connector if I remember correctly. It got dark outside I will double check at later date.

Srubydo1986 · 03-21-2010, 05:49 PM

what did you come up with?

HOGDADDY · 03-23-2010, 07:47 PM

Ok coming from my 4-pin connection at trans only 3 pins are used (the other is empty), it looks like one(simialr to red one) connector plugs into the vacuum switch on pass. side of firewall and one is for the brake switch and the other is a temp switch that I think is for allowing lock-up only when engine is fully warmed up.

I am not sure where the red one connects at this time I still think I was not using it. Surely someone knows here?

Keep in mind my trans was modified with a 4th gear lock-up switch. It basically goes into lock-up soon after I hit 4th gear. I don't know if this changes anything above but really don't think it matters.

03-19-2010, 08:49 PM	#1
Srubydo1986 The Crazy Machanic Join Date: Jan 2007 Location: Nokesville Va Posts: 1,437	Some electrical question in a new truck OK i want to put a 700r4 in my other truck but most i seen have the tbi engine. but now i got one with a carb and 700r4 in it. But the line going from trans to engine have a few lines some go over brake booster and into fire wall near connection block no problem trace and use but i do have one the makes no cents what its for. I have two pics one of wire and one of clip can you tell me were she goes pics would be great and clip thanks for looking __________________ 1986 Sliverado longbed 400 small block mean as hell, 700r4 trans (5 speed coming one day) 1970 chevelle 2dr sedan Latest update June 24 2007. 1957 4 door stationwagon - pink all original needing a good restore (body great, floors bad) newest additions 1965 shortbed fleet great granddads. Been told im nuts to bring it back from the dead (still going to happen) plans-all stock with a turbo 292 inline 3 speed column shift. and thats it big block 427 and 5 speed trans and ford 9 inch theyhave no home yet thinking what to put them in and a 79 c60 trash truck um no idea i have one Last edited by Srubydo1986; 03-19-2010 at 08:49 PM.*

03-20-2010, 08:59 AM	#2
SSC's76 No No Join Date: Jun 2005 Location: Pueblo Colorado Posts: 1,781	Re: Some electrical question in a new truck Looks like a lockup switch connector for the tq converter going to no where. Is it plugged into the connection on the drivers side of the transmission? If it is that is what it for. I found this link a while back kept it bookmarked just for the part numbers. Might be help full. http://www.73-87.com/7387garage/drivetrain/lockup.htm __________________ 1976 Custom Deluxe SWB Med FMB.3/4 Drop. Gen VI 454, Muncie HD 3 speed With Modified OE Hurst Shifter, 3.73 12 bolt, GMPP HO roller cam, Hooker headers, Performer intake with modified Q-jet, Accel distributor. Best 1/4 12.3 @108. Funnest run 19.84 @88 full 1/4 mile burn out. 1997 K1500 ext cab 5.7 stock except muffler

03-20-2010, 09:23 AM	#3
Srubydo1986 The Crazy Machanic Join Date: Jan 2007 Location: Nokesville Va Posts: 1,437	Re: Some electrical question in a new truck well it does go to trans on other end but this does connect to the trans directly it looks to plug into something up top that would have the trans do something. but all the emission stuff was removed prior to me so i just want to know if its emission relation for trans, or if it will effect the trans in any way. maybe a cruise control option not being used. __________________ 1986 Sliverado longbed 400 small block mean as hell, 700r4 trans (5 speed coming one day) 1970 chevelle 2dr sedan Latest update June 24 2007. *1957 4 door stationwagon - pink all original needing a good restore (body great, floors bad) newest additions 1965 shortbed fleet great granddads. Been told im nuts to bring it back from the dead (still going to happen) plans-all stock with a turbo 292 inline 3 speed column shift. and thats it big block 427 and 5 speed trans and ford 9 inch theyhave no home yet thinking what to put them in and a 79 c60 trash truck um no idea i have one

03-20-2010, 07:33 PM	#5
Srubydo1986 The Crazy Machanic Join Date: Jan 2007 Location: Nokesville Va Posts: 1,437	Re: Some electrical question in a new truck I'm really sorry i must not be explaining right. (it the other end to the trans side it hooks to trans then to ...... ) I'm might think its a vacuum control modular for the truck so the lock up works in the trans. but this is only a guess after looking at the vacuum diagram in the rad support but that has been changed once but does say 1986 models on sticker. so please anyone out there with a stock 700r4 truck that is originally carb equipped. please fallow the trans electric line from trans and tell me were it goes from there so i don't burn this trans up __________________ 1986 Sliverado longbed 400 small block mean as hell, 700r4 trans (5 speed coming one day) 1970 chevelle 2dr sedan Latest update June 24 2007. *1957 4 door stationwagon - pink all original needing a good restore (body great, floors bad) newest additions 1965 shortbed fleet great granddads. Been told im nuts to bring it back from the dead (still going to happen) plans-all stock with a turbo 292 inline 3 speed column shift. and thats it big block 427 and 5 speed trans and ford 9 inch theyhave no home yet thinking what to put them in and a 79 c60 trash truck um no idea i have one

03-20-2010, 08:47 PM	#6
HOGDADDY Registered User Join Date: Jul 2006 Location: Alabama Posts: 661	Re: Some electrical question in a new truck Ok if this helps, I have one on my 86 truck and it came stock with a lock-up Th350C and I believe it was originally connected to a vacuum switch that wouldn't allow lock-up til transmission (or engine possibly) was at normal operating temp. I since have installed a 700r4 and don't use this connector if I remember correctly. It got dark outside I will double check at later date. Last edited by HOGDADDY; 03-20-2010 at 10:17 PM.

03-21-2010, 05:49 PM	#7
Srubydo1986 The Crazy Machanic Join Date: Jan 2007 Location: Nokesville Va Posts: 1,437	Re: Some electrical question in a new truck what did you come up with? __________________ 1986 Sliverado longbed 400 small block mean as hell, 700r4 trans (5 speed coming one day) 1970 chevelle 2dr sedan Latest update June 24 2007. *1957 4 door stationwagon - pink all original needing a good restore (body great, floors bad) newest additions 1965 shortbed fleet great granddads. Been told im nuts to bring it back from the dead (still going to happen) plans-all stock with a turbo 292 inline 3 speed column shift. and thats it big block 427 and 5 speed trans and ford 9 inch theyhave no home yet thinking what to put them in and a 79 c60 trash truck um no idea i have one

03-23-2010, 07:47 PM	#8
HOGDADDY Registered User Join Date: Jul 2006 Location: Alabama Posts: 661	Re: Some electrical question in a new truck Ok coming from my 4-pin connection at trans only 3 pins are used (the other is empty), it looks like one(simialr to red one) connector plugs into the vacuum switch on pass. side of firewall and one is for the brake switch and the other is a temp switch that I think is for allowing lock-up only when engine is fully warmed up. I am not sure where the red one connects at this time I still think I was not using it. Surely someone knows here? Keep in mind my trans was modified with a 4th gear lock-up switch. It basically goes into lock-up soon after I hit 4th gear. I don't know if this changes anything above but really don't think it matters. Last edited by HOGDADDY; 03-23-2010 at 07:58 PM.



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