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That one is one of those basturd F150s with the upgraded suspension/axle package which was called called the "F250LD (Light Duty)". It's in between the "standard" F150 and the F250 Super Duty that came out in 99.
Whether that's what the OP has or not is unknown, he didn't say.
The unicorn by legend is a mythological creature with no proof of existence. The 1997 Ford F-250 with a 5.4L motor is real, as verified by the link to one I posted above, regardless of personal opinion as to whether it is a "real" truck or not.
So do you have any help for the OP or are you going to keep trying to convince us that something we see with our own eyes doesn't exist?