I was reading in another forum, I know,spank me later, that part of what the ECM did along with my speedometer was "engage the torque converter coupling (TCC) and lock-up the converter (the lock-up provides a no-slip operation of the torque converter).
Now that i don't have the ECM, what, I'm lost here(again).
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Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
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The ECM does indeed control the electrical signal to engage the lock-up converter clutch. All the trans needs for the LU to work is 12v, and a ground. The ECM provides the ground, in this case. You can move a couple of wires around on the internal trans harness and get LU working again, or you can use a toggle switch, or a vacuum switch. Or...you can just not worry about it. The LU function on a 350 trans really only provides a minimum improvement in fuel mileage, and even then only on long road trips. In normal, every day driving, the LU is basically useless.
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