th350 lockup non lockup

[motivman50]

What am I looking for non lock up th 350 can some one tell me difference?
And does anybody know what years the non lock up were in and what year the lock up where in.

[MusicMan70]

Not sure on the years; maybe late 70's to early 80's? The turbo 350C(Lock-up) has an electrical plug (4-prong) on the driver side and I believe a specific torque convertor.

Here is a side by side pic and the "clean one" is the 350C. Electrical connector is the blue plug. The cooler fittings were different on mine, but I was able to swap them. For the short time I used it, I never had the lock up connected, and research here told me it would not do any harm to leave it disconnected.

I eventually had my original turbo 350 rebuilt by a local shop and am happy with it.