PsychoticDeadGuy
1/2 ton status
What is the 4-prong electrical connection for on my '87 700?
CK5
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700R4 Electrical Help?
- Thread starter PsychoticDeadGuy
- Start date
sandawgk5
3/4 ton status
Not 100% but pretty sure that is the torque converter lockup signal from the ECM.
Ira
Ira
big83chevy4x4
3/4 ton status
close, its the lockup wiring, unplug it and lockup won't work and you may overheat the tranny.sandawgk5 said:
PsychoticDeadGuy
1/2 ton status
so, if i was to put this into a older K5, that had a TH350 in it, it doesnt have the 4-prong thingy, what do i do to make it work?
many stand alone kits for under 100 bucks. look in jegs or summit racing. thay sell them. easy to install.
PsychoticDeadGuy
1/2 ton status
sweetk30 said:
what do you mean by stand alone kits? what am i looking for?
www.summitracing.com has them. cheepest kit is ( tci-376600 ) i just looked it up for ya.
PsychoticDeadGuy
1/2 ton status
ok, thanks alot.
PsychoticDeadGuy said:
All GM trucks '82-86 with the 700R4 use a standalone wiring harness. Uses engine vacuum and the brake switch to determine lock/unlock. PERSONALLY I wouldn't spend $100 on something that GM already made and is extremely prevalent in the wrecking yards. It's a good system and IMO worked flawlessly.
PsychoticDeadGuy
1/2 ton status
well, since i am converting my 87 to a manual, i dont need that stuff right? where does it go to up in the engine bay? could i just remove it and would it work with the older truck that has the vacum line that goes direclty to the tranny? would my 87 throw any codes without it?
sandawgk5
3/4 ton status
PsychoticDeadGuy said:
In 87 the only thing the computer cares about is torque convertor lockup it does not sense anything else on the tranny so swapping in a manual is straight forward. Now 87 and later do not have a standalone tranny computer it is controlled by the vehicles computer so you need to find one from an 86 or earlier with a 700r4.
Ira
PsychoticDeadGuy
1/2 ton status
ok, so to put my 87 tranny in the older truck, i need to get the lockup stuff off of a 86?
sandawgk5
3/4 ton status
That is correct cause you have to leave the computer in the 87 to run the engine.
Ira
Ira
PsychoticDeadGuy
1/2 ton status
ok, thanks for the help.
