Brule, I found this article interesting reading. This may help in determining the stall of your converter and whether, it is what you thought it should be. It mentions one way to determine the stall is to select the 1:1 ratio in your gearbox or 2nd in your case and take off to a speed of 10-15 mph and then plant the accelerator to the floor. The tacho should instantly rise to the stall rpm and once noted back off the accelerator.
https://www.rodauthority.com/tech-st...ose-correctly/