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Old 07-12-2010, 06:35 AM   #1
72farmer
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TC lockup kit will this brake light switch work in my 67 C-10

I have a 700R4 transmission in my 67 C-10 that i am going to have rebuilt this week.It did not have the lock up torque converter hooked up.Will the brake light switch in this kit fit my 67 C-10?I tried to post the page on the wiring kit and did not know how.It is Painless Wiring kit part#60109 Please help ASAP
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Old 07-12-2010, 12:48 PM   #2
michael bustamante
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Re: TC lockup kit will this brake light switch work in my 67 C-10

can you post a link?
Im using a brake light switch from an 80`s model truck with cruise. It slips right in and easy to wore up, but im interested to see what you found
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Old 07-13-2010, 03:24 AM   #3
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Re: TC lockup kit will this brake light switch work in my 67 C-10

Does the switch have 4 terminals, with one pair N/C and the other N/O?

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Old 07-13-2010, 08:06 AM   #4
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Re: TC lockup kit will this brake light switch work in my 67 C-10

The brake light switch looks like it will fit and have the connectors for brake lights and torque converter lockup. The rest of the stuff in the kit don't know about, never worked on 700r4. Good luck.
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Old 07-13-2010, 12:10 PM   #5
michael bustamante
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Re: TC lockup kit will this brake light switch work in my 67 C-10

yes the 80`s chevy switch has the normally open /normally closed circuitry in it as well and it fits like factory, I just cut off the connectors and soldered on the new wiring
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Old 07-13-2010, 02:33 PM   #6
BarryB
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Re: TC lockup kit will this brake light switch work in my 67 C-10

This as struck my interests, can somebody explain why/what the brake light switch does for the 700r4 converter.
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Old 07-13-2010, 03:08 PM   #7
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Re: TC lockup kit will this brake light switch work in my 67 C-10

what the switch does is unlock the lock up type torque converter, when you apply the brakes. without it your vehicle would stall out when you came to a stop, similar to trying to stop a standard transmission vehicle without applying the clutch.
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Old 07-13-2010, 03:27 PM   #8
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Re: TC lockup kit will this brake light switch work in my 67 C-10

Quote:
Originally Posted by BarryB View Post
This as struck my interests, can somebody explain why/what the brake light switch does for the 700r4 converter.
The brake light switch has an extra set of contacts that opens the clutch circuit when you step on the brake pedal. I think the intent was to keep the engine from stalling in case you lock the rear wheels at speed.

The engine won't stall when the car is stopped because the clutch cannot engage when the transmission is in 1st gear. This feature is incorporated into the valve body design. I have wired the lockup circuit without the brake switch and did not have any problems.

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Old 07-13-2010, 03:40 PM   #9
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Re: TC lockup kit will this brake light switch work in my 67 C-10

switch went bad in my 85 iroc and it would stall out at a stop? changed switch and had no more problems?
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Old 07-13-2010, 04:29 PM   #10
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Re: TC lockup kit will this brake light switch work in my 67 C-10

If you had a stock valve body, I have no explanation for that. The converter clutch really is not supposed to engage in 1st gear.

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Old 07-13-2010, 04:37 PM   #11
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Re: TC lockup kit will this brake light switch work in my 67 C-10

but if your at speed and apply the brakes to stop, switch in-op, the converter will stay locked up in any gear, od down threw 1st. there will be no signal telling it to unlock. i think?
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Old 07-13-2010, 04:56 PM   #12
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Re: TC lockup kit will this brake light switch work in my 67 C-10

Yes, that would definitely happen if you locked up the rear wheels at speed. The transmission wouldn't have time to downshift and the engine would die. That's why I think the switch was included on the factory installations.

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