Powerglide VS Torqueflite

[33 IMP]

You are correct in your assement of rpm range. The converter has to put the engine in its sweet spot. Most often that will be flash stall somewhere between 500-1000 rpm below the shift point. Currently mine is about 800 below (7000 shift/6200 flash). My bet is it could still be a touch looser. When raising the shift point the flash stays at the same rpm.
Doug

That makes good sense.
My Mopar has around a 5000 stall, shifted at 5900 (used to shift 6200-6400, found it was no slower at 59)
Tina stalled around 5400 against the brake, I could shift anywhere from 6000 to 6500, depending if I wanted to be faster or slower.