WITHOUT ANY WARNING THE TRANSMISSION STARTED SLIPPING OUT OF FORWARD GEAR WHILE AT A TRAFFIC LIGHT AFTER RELEASING THE BRAKES AND GENTLY PRESSING THE ACCELERATOR PEDAL THE VEHICLE DIDNT MOVE. MANUALLY SHIFTING INTO 1ST GEAR WAS THE CAR ABLE TO MOVE BUT CAUSING A VERY HARSH LURCHING FORWARD CAUSING A LOUD "CLUNKING" NOISE. I WAS ABLE TO LIMP THE CAR 3 MILES TO MY HOME. I WAS INVOLVED IN A REAR END ACCIDENT AT THE NEXT TRAFFIC LIGHT. WHILE THE VEHICLE WAS IN 1ST GEAR AND HAVING THE BRAKES APPLIED THE TRANSMISSION CAUGHT IN GEAR AND LUNGED FORWARD CAUSING ME TO CONTACT THE CAR IN FRONT OF ME. BOTH MYSELF AND THE OCCUPANT OF THE VEHICLE I HIT SUSTAINED MINOR INJURIES AND WELL AS PROPERTY DAMAGE TO THE FRONT OF MY VEHICLE AND THE BACK OF THEIRS.