Works with the following Liftmaster, Sears and Chamberlain models 3280, 2280, 8100, 8100M, 8200, 9200, 1270, 1280, 1280R, 139.53964SRT, 139.53914, 139.53984SRT, 139.53664SRT2, 139.53800SRT, 139.53954, 139.54678SRT, 139.53678SRT, 139.53916D, 139.53914D, 139.53915DReplacement gear and sprockets are no longer manufactured for garage door openers made prior to 1984.
Belt Drive Models Only
If your belt pulley is a 9 cog this is the correct kit repair kit for your opener. If you have a 14 cog you need part number 41A4885-5
