TRAVELING WEST ON I-4, ORLANDO, FL BETWEEN SAND LAKE ROAD AND EXIT TO 528E AT 1:25 PM IN LEFT HAND LANE. AS I ATTEMPTED TO CHANGE LANES TO THE RIGHT I ACCELERATED SLIGHTLY AND FELT A "THUMP" (THE ONLY WAY I CAN DESCRIBE IT) THROUGH THE STEERING WHEEL AND THE TRUCK SUDDENLY ACCELERATED AND FISH TAILED. I LOST CONTROL FOR THAT INSTANT AND MY TRUCK STRUCK THE VEHICLE TO MY LEFT IN THE REAR BY THE TAIL LIGHTS ON THE PASSENGER SIDE. I WAS ABLE TO REGAIN CONTROL OF MY TRUCK AND PULL TO THE SIDE OF THE ROAD AS DID THE OTHER VEHICLE. MY COMPLAINT CENTERS ON WHY THE TRUCK SUDDENLY ACCELERATED; WHAT WAS THE "THUMP" THAT I FELT; IS THERE A PROBLEM WITH THE TRANSMISSION (NEW DESIGN FOR 2014) AND THE REAR DIFFERENTIAL; WHAT WOULD CAUSE THIS SUDDEN ACCELERATION? HAVE THERE BEEN OTHER COMPLAINTS OF THIS NATURE ON THIS OR OTHER CHRYSLER MODELS? PLEASE RESPOND ASAP.