As they have said it's best to remove it box and all from the bottom.

If you really want to you can remove the body from around the column, this is how I've done it before, but the body has to go up pretty high and you have to have everything just right, and move the truck forward or body back as you go up.

Grigg

•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-