Liftmaster 41c4220a Gear and Sprocket Kit for Chamberlain, Sears, Craftsman and LiftMaster 1/3 and 1/2 HP Chain Drive Models

The product had all the parts I needed for my opener. It was quiet a job getting it replaced but if you pay attention on how you dismantle everything it will go together well

Great, faster, cheaper and easier than changing out the whole drive box. Only the main gear on mine was worn out so thats all I replaced. Works much quieter and smoother than it has in years. Instructions are decent, lots of help on line (you tube) if you need it though.

This product arrived promptly. Easy to install, good quality parts & aved a bundle by fixing myself!!! Would recommend anyone to repair their own. Very easy to do and with high quality replacement parts like these, with the money you save, you will be happy you did!

Does what it is made to do…with one exception. The set screws on the collar on the end of the worm gear shaft are too long and hit the little circuit board next to it. The tabs on the black plastic interrupter run in a slot between two circuit boards one of which is the one the screws would hit. Good that I noticed that before running it or the circuit board would have been broken possibly making the opener unusable. I wound up using the old collar with shorter screws. Otherwise installation is pretty easy and everything fits as it should. I did run into a problem getting the bushing off the worm gear shaft due to burrs raised by the original set screws. I used a Dremel and small stone to grind down the burrs and then the bushing came off OK.

worked great with my garage door opener and had easy to read instructions on how use.

Part arrived on time, fit as it should.

Kit comes with all parts very happy great price

It was exactly as described

This kit had everything I needed. The only thing that would have been a little more helpful would be pictures in the instructions to identify some of the parts.

This saved me a TON of money on my garage door. An hour out of my time and now it works like new! Perfect!