I started an X73 build a few years ago but scrapped it in favor of an MX83. I have this diff left over. I'm not planning to ever use it, hence the sale. The invoice from the shop will be included with the diff.
Brand new 3.73 ring and pinion $200
Overhaul kit (using OEM parts) $214
OEM axle seals $59
Weir performance MAXGRIP LSD kit $190.00
Filled with redline MT-90 $32
The labor cost of the overhaul was $380. I don't consider the labor cost as a factor in selling this, I just want to let you guys know that a professional assembled this, not my dumbass. Note that friction modifier has been added. If you're lucky enough to find one of these at a yard, it's only $100 or so in my neck of the woods. eBay is more expensive.
I can ship freight in the lower 48 for under $100, or you can pick up locally if you're near the Seattle area. I will provide you with a tracking number.
I'm fairly lenient on price. PM me an offer if you're interested.