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#852656 - 02/09/11 09:43 PM Torque converter Lock-up Harness  
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St.Pete_MC Offline
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St.Pete
getting closer to dropping everything in the car, Any suggestion on a good lock-up harness for a 700R4. Going to be my 1st time installing one of these. I novice when it comes to wires and all of that stuff so something simple that is known to work good would be great.

#852713 - 02/10/11 01:30 AM Re: Torque converter Lock-up Harness [Re: St.Pete_MC]  
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Retro Offline
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Macon,Ga.
What car are you installing this into?
Do you want to Lockup TCC in 4th gear only?
Do you want to have Manual and Automatic Lockup control?
There're many easy ways to do this.
Several diagrams here>> http://www.rowand.net/Shop/Tech/LockupTCCWiring.htm
Part Info, bottom of Pg.>> http://www.rowand.net/Shop/Tech/AutomaticOverdriveTransmissionSwap.htm

#852787 - 02/10/11 04:58 AM Re: Torque converter Lock-up Harness [Re: Retro]  
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Installing into my 85 monte carlo.

yeah lock-up only in 4th (basically for the highway)

does'nt really matter to me between the manual vs automatic, which ever is less work I would say lol.

thanks for the links

#852798 - 02/10/11 07:06 AM Re: Torque converter Lock-up Harness [Re: St.Pete_MC]  
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Retro Offline
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Macon,Ga.
The wiring should already be there. The Trans Plug/Pigtail may need to be modified to fit in the 700R4 Trans connector. Some are clocked differently, "slots on Pins".

Basic wiring= 12V+ from Brake light switch to a Toggle switch to Pin-A on Trans Plug. This way you can turn it ON on the Highway/Freeway, OFF in town. When you press the Brake peddle it cancels Lockup, when it hits 4th it activates Lockup.

Are you using the ECM, CCC/Carb, CCC Distributor? Computer controls Lockup in stock system.

#852812 - 02/10/11 11:14 AM Re: Torque converter Lock-up Harness [Re: Retro]  
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1984_Z65 Offline
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1984_Z65  Offline
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Wahiawa, Hawai'i
You can add a vacuum controlled switch to unlock converter under high load conditions.

Superior makes one adjustable from 1" hg to 6" hg, about $32.

My 200-4R is configured for 4th gear lockup only, and I ran with a manual switch for a while.. then realized that with it locking only in 4th, the manual switch was kind of a moot point....

as retro said: 12V+ (source) into the normally closed circuit of the brake light switch, back out of the brake switch and into the pressure switch, sourced to a ported vacuum location (same as the dizzy) then to the plug on the trans.

The vacuum switch allows automatic disengaging of the lockup while climbing a grade or under WOT conditions to prevent lugging/pinging. letting off the throttle or otherwise taking away the load will allow the converter to re-lock when vacuum conditions return to normal.


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'15 Silverado HD (Daily Driver)
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#852839 - 02/10/11 03:27 PM Re: Torque converter Lock-up Harness [Re: Retro]  
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St.Pete_MC Offline
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St.Pete
No ECM or CCC Carb, Just holley 650DP and a MSD ignition set-up (Dizzy, 6AL, Coil)

does not sound to bad from both of the break downs you guys just provided, Im a super NOVICE when it comes to wiring lol, rather have a wrench and a socket. Preciate it alot guys

#853322 - 02/12/11 09:04 PM Re: Torque converter Lock-up Harness [Re: St.Pete_MC]  
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1984_Z65 Offline
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1984_Z65  Offline
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Correction.... the vacuum source for the switch is to full-time vacuum, not ported as I originally posted.... whoops


'84 SS 103K, '85 SS (Frame off)
'15 Silverado HD (Daily Driver)
'96 BBB Impala SS (85K garage queen)
'12 H-D FLTRXSE (36K parked)
'70 Pontiac Grand Prix Model J 400/TH400 survivor (103K)

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