JCB 3CX PROJECT 8 PROBLEM?

I HAVE A JCB 3CX GREY CAB SIDE DASH PROJECT 8, I AM LOSING FORWARD DRIVE NOW AND AGAIN, ROAD WORK MAINLY, SOMETIMES THE DRIVE GOES BUT NOT COMPLETLY THEN COMES BACK, IT SEEMS LIKE A LACK OF OIL BUT IT IS NOT, CHANGED FILTER AND TAKEN THE INTERNAL MESH GAUZE OUT THE BOTTOM OF TORQUE CONVERTER AND HAD METAL FILINGS N THE ODD BIT OF METAL, NOT NICE, CAN ANY1 HELP ME TO WHAT COULD BE WRONG? CLUTCH PACKS MAYBE GOING?