I keep blowing out my left rear diff bearing, new case, shimmed right, it has always felt kinda loose, is this common or is something wrong? Thought it may be an outdrive, replaced it, but after every race, about 45min. give or take, the left side outdrive has a buttload of play(back and forth). It is worse afterthan before i run it, first tried ae bearings, then went to protek with same results, new to 1/8 so need some advice, thanks