Transmissions and Drivetrain Need help with your trans? Problems with your axle?

4L60E TC lock up

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Old Jul 28, 2013 | 12:41 PM
  #1  
cumminsN14's Avatar
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From: galt, ca
Car: 86 Z28/86 IROC
Engine: 305 LG4/ LT1
Transmission: 700R4/4L60E
Axle/Gears: 3.42
4L60E TC lock up

Im being told that you need to find the wire from the brake switch that has 12v with foot off brake pedal, all i seem to have is a wire with 12v with foot on brake pedal and no power with foot off pedal. Its a 86 iroc and i have 2 brake switches at the pedal ones for cruise i guess, do i need a different brake switch or am i just not finding the wire? both switches have 2 wires coming out of them.
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Old Jul 28, 2013 | 06:07 PM
  #2  
vetteoz's Avatar
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: 4L60E TC lock up

Originally Posted by cumminsN14
i have 2 brake switches
both switches have 2 wires coming out of them.
But do both switches have power on one side of each switch?
What colors are the wires at each switch ?
Pull the wires off , put a DVM on the terminals of each switch and see which switch is NO and which one is NC.
Do they swap position when the pedal is pushed ?( the switch may be faulty )

Typical GM TCC wiring below

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Old Jul 30, 2013 | 01:01 AM
  #3  
cumminsN14's Avatar
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Joined: May 2013
Posts: 33
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From: galt, ca
Car: 86 Z28/86 IROC
Engine: 305 LG4/ LT1
Transmission: 700R4/4L60E
Axle/Gears: 3.42
Re: 4L60E TC lock up

Yes both connectors, 2 wires each connector, have power on one wire... I think one is orange and purple and the other is blue on both, not 100% sure though. Theres one switch with a vacuum line and it was broken when i got under there, i put it back together though but quite possible i put the plug in backwards maybe. I appreciate the diagram! Havent been able to mess with it yet, to many other cars keep crapping out. just put a 3rd fuel pump in my 03 suburban in 7k miles!
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Old Jul 31, 2013 | 05:47 PM
  #4  
vetteoz's Avatar
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Joined: Apr 2005
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: 4L60E TC lock up

Originally Posted by cumminsN14
have power on one wire... I think one is orange and purple and the other is blue on both, n!
You can see from the diagram , purple is the power to the TCC from the switch
Should have key on power fulltime , cutting off when the pedal is depressed
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Old Aug 11, 2013 | 01:27 AM
  #5  
cumminsN14's Avatar
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Joined: May 2013
Posts: 33
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From: galt, ca
Car: 86 Z28/86 IROC
Engine: 305 LG4/ LT1
Transmission: 700R4/4L60E
Axle/Gears: 3.42
Re: 4L60E TC lock up

Yes, thanks vetteoz i appreciate it!
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