I have a 2008 Ford F250 2WD. How can i make my truck 4WD?

Its a simple question i just don't know the answer. I have a 2008 Ford F250 XLT Super Cab, its 2WD and i wanna know how to make her 4WD. Axle swap necessary? Please let me know.

It would be a major job, as the front & rear axles would need to be replaced, as well as adding the transfer case would require the tranny to be modified. It would be quicker & probably cheaper in the long run to sell the 2wd & buy a factory 4x4.

Sell it and buy a 4WD, the conversion will cost more than buying a 4X4

Trade it in and buy a new one! Don't even attempt this, it isn't worth it and makes no sense.