Before "topping" off the fluid level, Make sure your up to operating temperature of engine/Transmission and you are on level ground for an accurate level check.
Personally, I prefer to stick with a Straight fluid for the Torqshift Transmission label Mercon LV and not one that states Dexron/Mercon. I have changed the Fluid on my Torqshift (Ford Transmission) several times and always use "Motorcraft Mercon LV" I have had good experience purchasing from Amazon
https://www.amazon.com/Motorcraft-XT...s%2C153&sr=8-9
My opinion is not to cut corners with transmissions & Fluids.