OK, the transmission was out of my truck so I purchased a jy one it worked fine till about 2 days after. Me being a idiot, I throw it in reverse and slam on the gas. After backing up aprox 20 feet the shifter gets stuck and when it frees up I have no gear period. I overhauled the transmission and didn't replace the pump, or converter. I haven't got any fluid in the cooler lines either. My question is, is this a pump, or converter problem?