HQRP Drive and Worm Gear Kit for Craftsman 13953671SRT1 13953671SRT2 13953671SRT3 13953672SRT1 13953672SRT2 13953672SRT3 Garage Door Opener Access System + HQRP Coaster HQRP&reg; Replacement Drive Gear and Worm Gear Kit plus HQRP&reg; Coaster; It Is Highly Recommended That You Replace Both The Drive Gear And Worm Gear At The Same Time; 100 Days Warranty!