Simply unbolt & remove. The side PTO cover for the t-case is a commonly available part (we stock it along with the gasket) so it can be made to look as if it were never there with the exception of the slot in the interior carpet kit.
Why remove? Clearance. I'm a big fan of the Toyota PTO setups, they work really well and are fairly tough however on the 70 Series in particular, they require a near 18" landing pad front bumper to mount. Here is the PTO on my other 74 (affectionalty known as Righty)
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As you can see the PTO and associated bumper take up some real estate. Great for light duty off-road but it would have completely hindered the travel this truck has seen thusfar and will see in the future.