switching a truck from 2 wheel drive to 4 is as easy as never putting it in 4 wheel drive.

Seriously, you could remove the transfer case, driveshaft, front differential and half shafts and the other little related goodies like shifters and brackets and stuff. May need a few things from a true 2 wheel drive version like transmission output shaft and a driveshaft just to start.

personall I don't know why you would want to do such a thing

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-