I sent the photos with the numbers on it to the parts department at my local dealer.
The part numbers are valid and helped prove the existence of this product.
They are attempting to order it and will let me know.
The XL-18 is definitely different than XL-3, they are 2 entirely different things.
I am unclear whether this is a one time treatment, or should be added to each transmission oil change over time.
If I can get this product ordered, I will change my QDC for new and add the XL-18 pronto.
While the OP reports that shifting is improved, it will be interesting to see if whine is also decreased.
2012 Shelby American Mustang GTS 580rwhp 485 ft/lbs Grabber Blue White Stripes
Ford Whipple, 5.0L, Tremec XL Magnum, MGW, Centerforce DYAD clutch, Boss 302 Torsen w/4:10s, 302R EPAS, Eibach Coil Overs, Fays 2 Watts Link, Dynotech DS, Shelby UCAs/LCAs, Wilwood brakes 6 piston 4 piston, Drake Bump Steer, heavy duty cooling, welded axle tubes, Interior Package, GT4 wheels, Borla Touring axlebacks, GT500 rear valence w/parking sensors, and airbag cover signed by Carroll Shelby.