HI I HAVE A 99 3.8 V6 WITH THE 4R70W AUTO TRANS.A COUPLE WEEKS AGO IT STARTED SLIPPING IN FIRST A LITTLE THEN IN 2 ND AS WELL.FIRST THOUGHT WAS THE BANDS WERE GOING,DO TO THE FACT THAT IT WOULD CATCH AND SHIFT ONCE IT WAS GOING.IF I STOPPED THEN IT WOULD START SLIPPING AGAIN.I BOUGHT SOME LUCUS TRANSMISSION FIX PUT IT IN TOOK IT ON A TEST DRIVE.SAME PROBLEM AT FIRST,TILL I DROPPED IN FIRST HIT THE GAS IT MADE A NOISE KINDA LIKE A CLUNK BUT NOT AS HARSH.ALL OF A SUDDEN I HAD NO SLIPPING IN ANY OF THE GEARS OR SHIFT POINTS.THE WEIRD THING IS NOW IT WONT GO IN REVERSE,NOT TO MENTION IT WILL GO THROUGH A GEAR IN NEUTRAL TILL IT HITS THE SHIFT POINT WHICH I HAVE TO PUT IN DRIVE.IF I PUT IN DRIVE IT WILL SHIFT FINE THROUGH ALL GEARS LIKE NORMAL. IT LOOKS LIKE IT MAY HAVE MOVED A LITTLE ON THE SHIFT CABLE ,BUT VALVE BODY AND EVERYTHING LOOKS GOOD.NO PARTS IN PAN OR SHAVINGS,ANY IDEAS OR SIMILAR EXPERIENCE LIKE THIS?