My Transmission

[stepsider]

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

[fat dan]

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.

[truckster]

Torque convertor lockup on a 71? No, they didn't have locking torque convertors. None of the THM 350s did.

[fat dan]

In order to wire it up you will need a kit from B&M. Summit has tem for $190.

[fat dan]

You have a 350C transmission.

[SS Tim]

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.

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[stepsider]

Thank you SS Tim, I think you hit the nail on the head. The picture shows the spot where the wire plugs in.