Check the listing for details. LiftMaster 41A2817 Replacement Gear Kit. Condition: New. Listed at 19.87 USD. Liftmaster-Sears Large Drive Gear Kit 41A2817 100% Brand New Authentic LiftMaster Part This drive gear replacement kit 41A2817 is for all Chamberlain Group chain and belt drive openers manufactured from 1984 to the present. Also used for Wayne Dalton opener models 100 - 320. Compatible with part number: 81B0045This is the manufacturer original equipment replacement part for the following garage door openers: Lift-Master, Sears Craftsman, Chamberlain, Master Mechanic, Garage Master. Sears Item# SPM3274613402 | Model# 41A2817-CA, Chamberlain replacement number 081B0045 Includes: Main drive gear Worm gear Replacement bushing, fittings, & pins Lubricant Repair Instructions included. All 1/3 Hp, 1/2 Hp, 3/4 Hp Residential chain and belt drive garage door openers manufactured from 1984 to the present for these manufacturers: Lift-Master Sears Craftsman Chamberlain Master Mechanic Garage Master Wayne Dalton models 100-320 Not compatible with Sears openers made before 1984 - body color of powerhead unit: brown, green, or yellow.