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I used a 1700 stall converter. That's as high as I would want. As to lock up. I put a 3 position switch on the dash and a 4th gear pressure switch inside the trans. The three positions are manual lock (in 2nd, 3rd or 4th), off, and 4th gear auto lock. The lock up solenoid is wired up to 12v...

I found my tall adapter under a k5 at the junkyard. I don't know what year it was. You can also find them on auction sites.

'92 was the last year of the 700r4, after that it became the 4L60e, electronically controlled. You want an '87-'92 700r4 ideally. There were tall and short adapters for the 700r4/208, you want the tall adapter.