2010 FLTRX. 8,000 miles. It seems that my bike has developed some kind of slippage when pulling up a hill or accelerating hard up through the gears. It feels like a rubberband effect, it will pull then let off or 'slip'. It seems to have gradually gotten worse. I not sure if it is the isolated drive sprocket, clutch, or primary chain. If I hold the rear tire, I do have a quarter inch of play in the rear sprocket. Will be contacting dealer tuesday. Just wondering if anyone has had this experience. Leaving for a thousand mile trip on friday, I'm a little nervous. Thanks in advance for your response.