700R4 1984-87 GMC PICKUP wiring - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-02-2005, 02:30 PM
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700R4 1984-87 GMC PICKUP wiring

Can anyone tell me what the wiring schem is for a GMC pickup with a 700R4 tranney it has 3 wires in a plug on the drivers side. I need to know what goes were and how they are controlled. Resently droped new motor in with blowe etc use to to be TBI I am no longer using the computer for anything but it is still in the truck. Any help would be great thanks Willie

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Old 06-03-2005, 04:54 AM
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You need a torgue converter lock-up kit. A number of companies make them or you can do a search and find a couple of DIY sites. TCI & Painless both have nice kits that you can get through Jegs or Summit.
This is off TCI's site...
Universal Lock-up Kit
Installation of this kit makes retrofits into non-ECM 700R4 or 2004R vehicles a snap. System allows automatic operation of the TCC in 4th gear under stable engine operation, and disengages the clutch when accelerating or down shifting. Also provided in the kit is a manual override option. Constructed from OEM connectors and oil resistant wire, we install this kit in all our complete 700R4 & 2004R StreetFighterŽ Transmissions.

Description Part No.
Lock-up Wiring Kit 376600
Replacement 2-wire TCC Solenoid for 2004R/700R4 376601
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Old 06-03-2005, 07:10 AM
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it was my understanding the early 700R4's are a little different then the later model ones. i DO know the 84's-700R4's use NO COMPUTOR & the early 700R4's are suppose to be JUNK, even though i put 250,000 harddd miles on mine though. so be sure of what year u have b4 buying anything...joe

here's some info on them w/wiring
700R4 info

another page
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Old 06-03-2005, 08:14 AM
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the wires to the tranny are the same through those years. Wire "A" is 12 volts with ignition switch "ON"... Wire "D" is ground. The wires inside the tranny pan are vastly different in the 84 - 87 years.


Do you know what year your truck is? You say "used to be TBI"... 84 trucks were not EFI motors.


The lock up kit as suggested would be a good idea

this goes back to the question stu asked alot... " year , make and model ? "
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