Have tried the Lucas Trans stop leak to no avail.
Here is a thought, but have never tried.
Take 1/8" flat washers and place 1 between each torque converter tab and the flex plate mount bolt area.
This will push the torque converter back 1/8" and gain you a new unworn area for the front trans seal to ride on.
May be worth a try before trying the stop leak additives.
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