Is the lockup on a 700r4 tranny a simple grounding signal from the ECU?

Im hoping by swapping over the plug that the ECU that runs the old 200c tranny lockup can do the 700r4 lockup?

Thanks

 

Yes, the ECM pulls the signal to the TCC solenoid low (to ground) to enable lockup.

RBob.

 

Thanks,

So i assume with a plug swap I should be fine as the 200c would be controlled the same way?

 

The 700R4 does lock up due to a ground signal, but internally the switches are different between years - some being a Normally Closed switch, and some being a Normally Open switch. In the carb section, there is a sticky on TCC lock up - it's all explained in there (with wiring diags).

 

The TH200C didn't have a 4th gear switch, so the ECM isn't going to be expecting any signal from it.