This listing is for an aftermarket part NOT MADE by LIFTMASTER/CHAMBERLAIN.
We offer the original manufacturer parts on our site as well
41c4220 aka 41a2827 Chain drive Gear assembly kit used on all AC powered
Fits Sears Craftsman, Liftmaster, and Chamberlain Residential Garage door openers
Instructional Video on how to change the gear kit
for units from 1993 to present