If finding parts or using that Getrag diff proves difficult, keep in mind that you can use any IRS rear diff by running it upside down (high pinion). Some factory 4wd applications actually used this setup without any oiling problems.
Not sure what you mean by cutting open a closed knuckle... If you're referring to the 4wd front axle "closed knuckle", they are NOT designed to run open. They would be full of oil or grease, and have an open CV (commonly known as a Birfield joint) at the steering axis. I don't think you could get a closed CV type 1/2 shaft in there without some MAJOR re-engineering. That's why I like the S10 hub for this kind of thing...just bolt it on and go.
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Ray Kaufman-Wyotech chassis fab instructor
Custom suspension design and consultation.
(Now 2) Big Block asphalt supermodified ('cause too much is never enough...)
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