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Old 04-07-2007, 09:27 PM   #1
Texas1971
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electic plug on trans

Thanks in advance to great site with great contributors! What's the electical plug on the trans (TH350) driver's side?
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Old 04-07-2007, 09:31 PM   #2
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Re: electic plug on trans

its a stupid spark control for the emissions stuff not needed in real life unless you're an al gore fan
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Old 04-07-2007, 09:31 PM   #3
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Re: electic plug on trans

Welcome! Try this link: http://www.novak-adapt.com/knowledge/th350.htm
Hope it helps!
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Old 04-07-2007, 09:51 PM   #4
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Re: electic plug on trans

Because, I thought it had something to do with back up lights ... also have a set of wires on a plug (brn, ylw, grn, lt grn) that looks like rear lights that does not go anywhere.
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Old 04-07-2007, 09:54 PM   #5
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Re: electic plug on trans

Quote:
Originally Posted by Texas1971 View Post
Because, I thought it had something to do with back up lights ... also have a set of wires on a plug (brn, ylw, grn, lt grn) that looks like rear lights that does not go anywhere.
I believe that one goes from the firewall plug all the way back to the tail lites...
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Old 04-07-2007, 10:57 PM   #6
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Re: electic plug on trans

ewwww al gore : (
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Old 04-07-2007, 11:30 PM   #7
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Re: electic plug on trans

The back up light switch is actually located on the steering column (if it is an auto trans column) right before it enters the firewall (above the pedals).
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Old 04-07-2007, 11:34 PM   #8
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Re: electic plug on trans

That's the wire for the TCC, torque convertor clutch.
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Old 04-08-2007, 07:18 AM   #9
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Re: electic plug on trans

That switch indicates that the tranny is in high gear, and it was used by the TCS (Transmission Controlled Spark) system.
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Old 04-08-2007, 07:37 PM   #10
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Re: electic plug on trans

I'm not sure what year you have, but mines a 1971 Cheyenne w/TH350 and the TCS switch is on the passenger side. To my knowledge they were always on the passenger side. I haven't seen any of the repair or reference books indicate a TCS switch on the Drivers side, but I'm only referencing my production year also.
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Old 04-08-2007, 08:02 PM   #11
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Re: electic plug on trans

If it's a squarish plastic plug pointing straight up on the driver's side, it's for a lockup converter, meaning you have a TH350C trans.
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Old 04-08-2007, 08:15 PM   #12
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Re: electic plug on trans

Mine has a round plug on drives side that hooks up the the kickdown switch on the carb. I'm a 68, with a 2bbl 307.
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Old 04-08-2007, 08:34 PM   #13
Texas1971
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Re: electic plug on trans

Tx Firefighter has it described to a T. Just don't know what should plug into it. Thanks guys.
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Old 04-08-2007, 08:39 PM   #14
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Re: electic plug on trans

The trans is actually later model than your truck. A lockup TH350 can actually be run disconnected, unlike some other lockup trans. I've run them unplugged for years. Don't worry about it.
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