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05-23-2015, 10:29 PM
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#1 |
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Registered User
 
Join Date: Nov 2013
Location: Roseville, CA
Posts: 207
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My Transmission
I have a TH350 (13 bolt Pan), While doing my rewire in the engine bay, I pulled a electrical plug from the trans. Don't know what year the trans is. Could this be converter lockout ? Did they come in 1971 GMC ? If so how do you wire it. What happens if its not hooked up ? Looking for info. Thanks
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05-23-2015, 11:55 PM
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#2 |
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Keep on Trucking
Join Date: Nov 2012
Location: Tryon, Ok.
Posts: 44
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Re: My Transmission
It's the torque converter clutch, if you don't use it you will lose the converter lock up function which will cause reduced gas mileage.
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05-24-2015, 12:22 AM
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#3 |
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Senior Member
Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,882
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Re: My Transmission
Torque convertor lockup on a 71? No, they didn't have locking torque convertors. None of the THM 350s did.
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05-24-2015, 12:24 AM
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#4 |
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Keep on Trucking
Join Date: Nov 2012
Location: Tryon, Ok.
Posts: 44
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Re: My Transmission
In order to wire it up you will need a kit from B&M. Summit has tem for $190.
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05-24-2015, 12:27 AM
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#5 |
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Keep on Trucking
Join Date: Nov 2012
Location: Tryon, Ok.
Posts: 44
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Re: My Transmission
You have a 350C transmission.
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05-24-2015, 01:20 AM
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#6 |
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Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: My Transmission
Sounds like the plug for transmission controlled spark used as part of CEC system in 71. That would be the only wiring on a factory 71 TH350 installation. Might try the service manual ection 6T (71 and 72) for some more information, I just don't have the time now.
If you can post a picture I might be able to confirm it later for you. * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here
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Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID ** Blazer SPID ** Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders ** Do you have a 1972 Plaid Pickup? ** Plaid Blazer ** Plaid Suburban Last edited by SS Tim; 05-24-2015 at 01:27 AM. |
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05-24-2015, 09:32 AM
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#7 |
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Registered User
Join Date: Nov 2013
Location: Roseville, CA
Posts: 207
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Re: My Transmission
Thank you SS Tim, I think you hit the nail on the head. The picture shows the spot where the wire plugs in.
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