This is a rebuilt transmission with new: bearings, baulk rings [3], Gears as needed [usually 1st gear, laygear and Reverse], gaskets and seals which includes the front cover with seal. You can send your gearbox in to us for rebuilding and If we have one on the shelf we can send that to you with no core charge. We can charge you a core charge and send out right away and you will get your core charge back as long as your core is rebuildable. Your core has to be rebuildable, do not send a box that has been sitting out in the weather or from the rear of your garage. If rusty inside it is not rebuilable! Any questions do give us a call or email.