Friend wants to run a 904/998/999 based lock-up trans in a 66 Dart behind a mild 360. Main question is - do all lock-up 904's shift into lock-up "mechanically" - referencing high gear applied and governor input, or are there any lock-up 904's that have an electric solenoid that dictates converter lock-up? I thought I remembered seeing a lock-up 904 with a connector at the left rear of the case for a lock-up solenoid wire. Trans didn't have a trans brake in it, before any one asks. Is there an "electric" lock-up valve body - if so - application?

And does anyone make a "budget" converter for this trans that has a little better stall and would live behind a 350 hp 360?