must be something wrong then, for years now on many different vehicles I have used hard line with a small piece of either transmission specfic rubber line (neopreme) or fuel injection hose on the radiator and trasmission, then double clamped it. your transmission runs less then 100 PSI. Most FI systems run 50+ infact some mazdas run 85 PSI and don't leak with FI rubber line and double clamps (also special clamps that tighten tighter)
