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What is the blue plug?


pocobill7t1

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Sounds like you're describing the vent plug. I can't see the attached picture clearly. Is it an electrical plug? Probably a th350c with lock-up converter?

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The picture is not my tranny, but the blue plug / connection is the same as in my car.. The trans came in the car when I bought it a couple of years ago. I have a feeling this must be a new transmission 1978 +.

Sorry for the bad pic I will get an actual one later on. It looks like a electrical connection but unable to get a good look as it is hard to see in the car. Will try to get a mirror to see what's on top of it. Thanks guys

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Turbo 250C from 79 thru 84 and turbo 350C from 79 thru 84 used this plug for the TCC control wiring. Its used for convertor lock-up and the computer electrical-mechanical control system.

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Turbo 250C from 79 thru 84 and turbo 350C from 79 thru 84 used this plug for the TCC control wiring. Its used for convertor lock-up and the computer electrical-mechanical control system.

OK so I don't have anything hooked up to this? Advantages or disadvantages .

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Not using the lock-up function will not hurt the transmission BUT why not hook it up to utilize the lock-up feature at cruise. B&M makes a wiring kit for this. "NOTE" Lock-up and non lock-up toque converters are not interchangeable, must use the torque converter for the style trans

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You have to take off the torque converter. A non lock-up converter will not fit all the way on to the input spline There is a extension to the input shaft that has a "O" ring on the end. Locking up the converter gives about 1 to 3 MPG's. Tranny runs cooler a bit as well.

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