TH350c - wiring/vacuum diagram


New member
Jul 23, 2021
New member here. 1980 Scottsdale w/350ci & TH350c transmission.

I am trying to find a diagram that shows the electrical and vacuum conditions required in order to engage and disengage the lock up torque converter. Many diagrams on Google search but I can’t be certain they reference the TH350c. Thanks


New member
Jul 2, 2021
The 350c connector is different than the 200R4 and 7004R. Connect D to B and you have your 3rd gear switch and ground. Put what ever other switches in the 12V A terminal side. You can put them in the ground circuit too but putting them in the 12V side uses the least wiring.

Use the 2004R or 7004R circuits for the 12V side since there are a million examples of those. Keep in mind you already have the hi gear switch.


  • 350c trans connector3..jpg
    350c trans connector3..jpg
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New member
Oct 17, 2021
Do this apply to the MV4 transmissio.... New here to the group first timer first build on my own pics coming soon

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