700r4 lockup control
Thread Starter
Pro
Joined: May 2005
Posts: 745
Likes: 0
From: Miami Florida
700r4 lockup control
now that its out of the car, how do i hook up a toggle switch to engage lock up. which terminal on the existing plug and does it need any 12 volts or relayed high amp 12 volts?
Le Mans Master
Joined: Aug 2003
Posts: 7,720
Likes: 12
From: Chattanooga TN
Can't tell which terminal, sorry don't have a manual handy. It is not very high amperage, less than 10 at least. The way most aftermarket kits do it is as follows: 1 terminal is ground (in a computer car this is the one the ECM grounds). 1 terminal is 4th gear, it provides a ground (to the ECM) that tells you that you are in 4th gear. Most aftermarket kits tie these together so that you provide a ground only in 4th gear. Another terminal is for 12v ignition switched power. Kits vary here. Some have vacuum switches so you only get power when you have sufficient vacuum (cruising), some also/or have power switched by the brake pedal.
I would use some of these things and not just a toggle. You will burn the converter lockup up if you aren't careful.
I would use some of these things and not just a toggle. You will burn the converter lockup up if you aren't careful.
Last edited by markdtn; Mar 28, 2006 at 07:39 AM.
Le Mans Master
Joined: Jul 2001
Posts: 9,622
Likes: 16
From: absecon nj
Well i have mine like this newer style brake light switch ,1 wire comes out of that that is 12 volts going to purple wire at plug on tranny which i think is A i have D grounded to the case.WHen the brakes are applied it unlocks stopping the 12 volts going to the plug.You can just put a toggle switch between the 12 volts and turn it on and off.
Race Director
Joined: Apr 1999
Posts: 11,520
Likes: 13
From: CORVETTE 77 385 C.I. TEXAS
Originally Posted by markdtn
... You will burn the converter lockup up if you aren't careful.
http://www.diy-efi.org/gmecm/papers/tcc.txt
"Also note that the GM 700R4 (4L60) transmission does not route fluid to the cooler unless the TCC is locked."
That part of the link which was quoted may not be accurate.
Cooling for the 700R4 is Something to look into.
Last edited by Ganey; Mar 29, 2006 at 10:29 AM. Reason: to clarify
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Originally Posted by rastadr
now that its out of the car, how do i hook up a toggle switch to engage lock up. which terminal on the existing plug and does it need any 12 volts or relayed high amp 12 volts?
Instructor
Joined: Nov 2005
Posts: 129
Likes: 1
From: Plano Texas
Originally Posted by Ganey
Actually you can burn up the whole trans.
http://www.diy-efi.org/gmecm/papers/tcc.txt
"Also note that the GM 700R4 (4L60) transmission does not route fluid to the cooler unless the TCC is locked."
Something to look into.
http://www.diy-efi.org/gmecm/papers/tcc.txt
"Also note that the GM 700R4 (4L60) transmission does not route fluid to the cooler unless the TCC is locked."
Something to look into.
Le Mans Master
Joined: Aug 2003
Posts: 7,720
Likes: 12
From: Chattanooga TN
It has been said before in other places:
"Also note that the GM 700R4 (4L60) transmission does not route fluid to the cooler unless the TCC is locked."
I thought it does NOT route fluid to the cooler from the converter when it WAS locked, but DID route fluid to the cooler from the pan always.
You are pulling hard, trans heats up, converter locks with hot fluid in it, fluid in pan cools, hit next hill, converter unlocks releasing hot fluid to cooler, but fluid gets hotter, visious cycle.
"Also note that the GM 700R4 (4L60) transmission does not route fluid to the cooler unless the TCC is locked."
I thought it does NOT route fluid to the cooler from the converter when it WAS locked, but DID route fluid to the cooler from the pan always.
You are pulling hard, trans heats up, converter locks with hot fluid in it, fluid in pan cools, hit next hill, converter unlocks releasing hot fluid to cooler, but fluid gets hotter, visious cycle.
Last edited by markdtn; Mar 29, 2006 at 07:11 AM.
Drifting
Joined: Jul 2004
Posts: 1,695
Likes: 65
From: Kissimmee fl
Finalist 2021 C3 of the Year - Modified
2017 C3 of Year Finalist
Cruise-In VIII Veteran
St. Jude Donor '07
Originally Posted by Ganey
Actually you can burn up the whole trans.
http://www.diy-efi.org/gmecm/papers/tcc.txt
"Also note that the GM 700R4 (4L60) transmission does not route fluid to the cooler unless the TCC is locked."
Something to look into.
http://www.diy-efi.org/gmecm/papers/tcc.txt
"Also note that the GM 700R4 (4L60) transmission does not route fluid to the cooler unless the TCC is locked."
Something to look into.
Just after having a 700r4 put in my 69 I blew a cooler line hose connection. In one block It pumped out 6 quarts of trans fluid, and I am sure the tc was not locked up because the power switch was not on!!
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
5 Best & 5 Worst Corvette Daily Drivers
Joe Kucinski
The Headlights of Every Corvette Generation Explained
Joe Kucinski
5 Best & 5 Most Overrated Corvette Track Packages of All Time!
Joe Kucinski
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
Race Director
Joined: Apr 1999
Posts: 11,520
Likes: 13
From: CORVETTE 77 385 C.I. TEXAS
Originally Posted by JustForFun
how does it signal to the tranny that its in 4th gear? Does it ground out the b terminal to signal 4th gear operation?
SEE http://www.highperformancecars.com/crosley/lockup1.htm
Safety Car
Joined: May 2001
Posts: 3,758
Likes: 3
From: Surrey
As Ganey said, it all depends on how it's wired up inside. On my BTO 200-4r Pin A gives TCC lockup in OD & pin D gives lockup in 3rd gear (apply 12V to the pin, I guess the ground is internal via the case). My Th350C needed 12v on pin A & pin D was ground (via the ECU). None of this helps you apart from the fact that I measured the resistance of a new TCC solenoid for the TH350C. It worked out that it would draw 0.5A at 12v. I've wired 12v directly from another brake switch on the brake pedal to the trans & have had no problems with large sparks, melting wires, or burning smells! ie it appears that you don't need to use a relay in the circuit (assumint the 700 TCC solenoid draws a similar current).
