HQRP Drive and Worm Gear Kit for Craftsman 13953628SRT 13953628SRT1 13953629SRT 13953629SRT1 13953632SR 13953635SRT 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!