The issue is that the mass rebuilders don't guarantee that their box meets original specs.
You will likely get a "good" one. But you're not guaranteed to get one build "right". If they run out of the proper torsion bar...you get whatever is handy. They mis-mark a gearset, you get the wrong ratio.
I looked into this years ago. The packaging says that the part inside meets all the specs for OEM, in fact they'll claim it's better in some ways. When you actually get ahold of Customer Service, they tell you that it'll fit and function, but internal parts aren't guaranteed to be "correct".
So there's the risk: Dramatically lower price, you may have to install and send back several before you get one that's what you wanted to begin with. And just because YOU get one that's correct...or not correct...doesn't mean that thirty other people got what they wanted, because in the end it's a diceroll.
THAT is why I bought used Grand Cherokee boxes right off the vehicles. They may be used--but at $30 each, and I have several, I'm bound to have a good one for even less than the mass-rebuilder price. The rag joint is gonna cost me the same no matter who I buy it from; which leaves only pump and hoses to dick with. Lee, I think, sells brass "seats" for the old style hoses in the new-style boxes. Supposedly, the metric threads in the new boxes are "close enough" to the SAE threads of the old style hoses that it isn't a problem when you press in their brass hose seats so the flared hoses have something to seal against.
I'm more likely to use specialized fittings to convert to the aftermarket so-called "AN" (it's not really "AN", that's a long-obsolete military spec that today's parts are unlikely to meet except in the most general terms) hose ends and hoses.
I can live with that.
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