Recommendations for mail order transmission?

Your essentially looking to buy a core and have it rebuilt. Options are having a trans shop source a core and they can rebuild it. Or you can source a core, take it to them for a rebuild. You could stay pretty much local, have them do the pulling and installing or do that yourself. Either way you can then sell off your old one. I’d be looking here and elsewhere for a rebuilt one ideally or a good core. Then take it in locally to be rebuilt. You don’t want to deal with long distance vendors and shipping etc. Them honoring the warranty is pretty much worthless (the terms are very specific in most cases and very restricted) and the logistics will be a nightmare if you have issues with any possible claim. I’d stay local regardless