Just a trim package I think. Kinda like a special edition. I had a Rio Grande YJ at one time and the custom paint,decals,and the interior seats were the only difference from a plain YJ. I think Twisted has an older YJ Sahara.
The Wranglers that came with the 30" tire & wheel package will have the D44, whether it's a Sahara or not. Not all Saharas had 30 tires from the factory (Mine didn't).