In the vernacular what the Cummins-equipped LNVTs came with is called a bronze, non-self-aligning, righthand thread, spud type, packing box with secondary lubrication. That's a mouthfull.
To break this down into manageable chunks here's a picture of a Buck Algonquin bronze, self-aligning, righthand thread, spud type, packing box.
The pictured packing box is self-aligning because it freely floats on the prop shaft. Compare this to the LNVT's packing box which is fixed in place via a pillow block. The lubrication water for the Buck Algonquin packing box comes via the stern tube. The LNVT packing box receives lubrication water from the stern tube and also from the engine's raw water system.
The LNVT's packing box does double duty: keeping water out of the boat and the shaft from whipping.
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