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Usually when a transmission shop rebuilds a tranny they chuck the old converter and replace it with a new one, but if they just fix what's wrong.... say a bad valve body, they leave the working parts alone. Some torque converters have a electric lockup that locks the converter tight (just like a engaged clutch) I suppose that might be why they were checking the electrical system...... but I couldn't say for sure, I do know that if the tranny locked up the rear wheels normally wouldn't be able to turn...... so if it locked up when you were driving it would be like you yanked the emergency brake...... and would make a much nastier sound than a 'pop', Although to tell you the truth..... in all my years of wrenching I've never seen a converter lock up..... they usually just sit and spin when they fail, that's why I'm thinking your truck might have the electric lockup converter.
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