I talked to CJ today at marlin and they did double charge me for cores, but after he nicely apologized, they said I could just apply it to a HP Elocker in 5.29 and pay the difference, 200 bucks. The problem is that in order for me to install my transmission, I need to install my dual cases.Then I can mail the cores back to marlin and get my HP Elocker. In order to install my dual cases, I have to install my rear lift. In order to install the rear lift, I need to gear my e locker rear third. In order to install the rear lift, I need to do the sas. In order to do the sas, I need to build my axle aaaannnddd...... have a HP Elocker... Life is tough