Sure, if he has the right length dipstick.
Also at TF trans that is overfilled and foams the fluid will spit it out the vent.
I have spent a lot of time around transmissions and I don't recall ever having one go because of over filling.
Plenty from under filling and burning up from repeated attempts to make it move thinking it's full when it really isn't.
I suggested another quart based on this, as the extra quart won't hurt anything.
What if he adds that extra quart and it seems fine after?
Then we have to wonder if it got hurt trying to make it go anyway even though a little more fluid could have saved it, but no one bothered to do the simplest thing to find out.
