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Overdrive Wiring for Fourth Gear

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Old Mar 17, 2022 | 10:44 PM
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Overdrive Wiring for Fourth Gear

So I got this car and someone installed like a vacuum driven lockup on it and they cut the harness and I can't find it anywhere in the looms or anything. On the ECM on a 84 z28 what are the pin outs on it for the lockup and does anyone have diagram of the ECM pinouts? I can re wire them if needed but any help would be appreciated. Thanks
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Old Mar 17, 2022 | 11:01 PM
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Car: Resto-Mod 1987 IROC-Z Clone
Engine: Alky fed L92 Vortec Twin-Turbo 6.8L
Transmission: My own built/ design 4L80M
Axle/Gears: Custom 12 bolt (4.10:1)
Re: Overdrive Wiring for Fourth Gear

Which Engine Option do you have?
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Old Mar 18, 2022 | 12:37 AM
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Re: Overdrive Wiring for Fourth Gear

Originally Posted by vorteciroc
Which Engine Option do you have?
I Have a 84 Z28 5.0 HO
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Old Mar 18, 2022 | 05:03 AM
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Re: Overdrive Wiring for Fourth Gear

Originally Posted by Hiebmesser
So I got this car and someone installed like a vacuum driven lockup on it and they cut the harness and I can't find it anywhere in the looms or anything. On the ECM on a 84 z28 what are the pin outs on it for the lockup and does anyone have diagram of the ECM pinouts? I can re wire them if needed but any help would be appreciated. Thanks

Hi Hiebmesser, welcome to TGO. Here is your 1984 wiring diagram showing the TCC wiring at the top left side of the drawing.

PS, this is from the "Austin Third Gen" site and it should be accurate, despite the "Transaxle" typo........


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