Is the new mercon tranmission oil is ok for automatic tranmission

A 2005 Ford F150 XLT with a 4.6-liter engine typically takes around 12 quarts of transmission fluid. It is recommended to use either Mercon V or Mercon Automatic Transmission Fluid. It is important to consult the owner's manual for the specific transmission fluid recommendation for your specific vehicle as it can vary depending on the transmission type and model.

Transmission fluidMotorcraft MERCON ATF Automatic (5R55N) 11.2L (11.9 quarts)

Motorcraft MERCON ATF Manual 1.1L (2.3 pints)
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Not sure what you mean by "better oil" but I'll tell you this... The M50D transmission is designed to use ATF. If you're using a stadard Type F fluid then yes, there is a better oil. It's Mercon V ATF. I believe this tranny takes 3 qts.
I hope this helps!

Timing belt change is 80k with water pump

Automatic Transmission uses MERCON V ATF, 12.7quarts.

Transfer Case uses MERCON ATF, AWD 1.25 quarts, 4 wheel drive 1.4 quarts.

Source Ford owners manual.

Manual, Auto??? what do you want to know???

DONT USE GEAR OIL IN A MANUAL TRANSMISSION. it will blow your seals out. the gear oil is too heavy and will block passages in the tranny

MERCON ATF

I know this sounds crazy according to Ford:

You can use-
Motorcraft MERCON Multi-Purpose (ATF) Transmission Fluid XT-2-QDX MERCON® Alternative Transaxle Fluid - SAE 75W90 Gear Oil F32Z-19C547-MA API GL-4
You are seeing that right, one instance they call for 75W90 and the other it is ATF. It is ok to run either, 75W90 will give you smoother shifts and less noise.

This transmission is filled through the VSS (Vehicle Speed Sensor) hole.

MERCON (R) Multi-Purpose Automatic Transmission Fluid XT-2-QDX

CAUTION:
Using a transmission fluid that indicates a dual usage MERCON and MERCON V in a transmission application requiring MERCON, may cause internal transmission damage. The use of any fluid other than the recommended fluid may cause transmission damage. Some fluid labels may indicate dual usage such as MERCON and MERCON V. These dual-usage fluids are not to be used in transmissions that use only the MERCON type fluid. These dual-usage fluids may be used in transmissions that require MERCON V use.