pocobill7t1 Posted January 21, 2017 Share Posted January 21, 2017 Quote Link to comment Share on other sites More sharing options...
pocobill7t1 Posted January 21, 2017 Author Share Posted January 21, 2017 It is a blue type of plug that is on the drivers side on a turbo 350, just near where the shift linkage connects to transmission. Quote Link to comment Share on other sites More sharing options...
monte70car Posted January 21, 2017 Share Posted January 21, 2017 Bill did the transmission come out of your car or out of another car? I remember someone on here a few years back as running a 350 that had the option to lock up the convertor so that could be the case here. 2 Quote Link to comment Share on other sites More sharing options...
Mo's70MCs Posted January 21, 2017 Share Posted January 21, 2017 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? 1 Quote Link to comment Share on other sites More sharing options...
pocobill7t1 Posted January 21, 2017 Author Share Posted January 21, 2017 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 Quote Link to comment Share on other sites More sharing options...
pocobill7t1 Posted January 21, 2017 Author Share Posted January 21, 2017 lets try this picture. Quote Link to comment Share on other sites More sharing options...
pocobill7t1 Posted January 21, 2017 Author Share Posted January 21, 2017 try again Quote Link to comment Share on other sites More sharing options...
mrj52 Posted January 22, 2017 Share Posted January 22, 2017 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. 2 Quote Link to comment Share on other sites More sharing options...
pocobill7t1 Posted January 22, 2017 Author Share Posted January 22, 2017 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 . Quote Link to comment Share on other sites More sharing options...
pocobill7t1 Posted January 22, 2017 Author Share Posted January 22, 2017 Quote Link to comment Share on other sites More sharing options...
pocobill7t1 Posted January 22, 2017 Author Share Posted January 22, 2017 " Quote Link to comment Share on other sites More sharing options...
mrj52 Posted January 22, 2017 Share Posted January 22, 2017 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 1 Quote Link to comment Share on other sites More sharing options...
pocobill7t1 Posted January 22, 2017 Author Share Posted January 22, 2017 Is there a way to figure out what converter is in there or does it have to be takin out? Does locking up the converter really help and is it worth it. New to this. Quote Link to comment Share on other sites More sharing options...
mrj52 Posted January 22, 2017 Share Posted January 22, 2017 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. Quote Link to comment Share on other sites More sharing options...
pocobill7t1 Posted October 6, 2017 Author Share Posted October 6, 2017 Just to up date, this plug is for a lock up converter. Don't be afraid to pull this out as I found out it has a replaceable O ring. Replaced the o ring and no more leaks. Quote Link to comment Share on other sites More sharing options...
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