41ac050-1 will this work?

The part # you are giving is the main board. The sprocket does have a separate part#. You're better off getting the kit in case other parts are broken that you didn't know about. Anyway, the kit doesn't cost much more than just the sprocket. This is used in multiple door openers, very common.

Does this work for model 139.54985

read on the website OR it fits Chamberlain, Sears, Craftsman 1/3 and 1/2 HP Chain Drive Models

Will this kit work with a linear ldo50 garrage door opener?

No it won't Liftmaster/Chamberlain are different manufacturer than the LDO50 which is made by Linear

I have this craftsman motor, and my gear assy is the same, but..mine is belt, not chain. can i just swap the sprocket out ?

I dont think you can the gear and sprocket is one assembly your top is for chain drive not belt it won't come apart from what I saw with my repair.

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Liftmaster 41c4220aギアとスプロケットキットの交換用。Chamberlain、Sears、Craftsman 1/3および1/2 HPチェーンドライブモデルに適合。

Product ID: 733850675

🔧Compatible with multiple 1/3 & 1/2 HP chain drive models

⚙️Precision-engineered gear & sprocket

🛠️Complete installation kit included

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Description

⚙️ Upgrade your garage opener with precision and ease — don’t get left behind!

DIY FRIENDLY - Step-by-step installation tutorial ensures quick, confident setup
ALL IN ONE KIT - Includes gear, sprocket, worm gear, grease, and bearings for hassle-free replacement
TRUSTED PERFORMANCE - Backed by 4.7-star rating from over 7,700 satisfied customers
DURABILITY ENGINEERED - Premium materials designed to withstand heavy-duty garage door cycles
SEAMLESS COMPATIBILITY - Fits Chamberlain, Sears, Craftsman & LiftMaster chain drive openers (1984+ models)

The TCK TECH Liftmaster 41c4220a Gear and Sprocket Kit is a top-rated replacement part designed for Chamberlain, Sears, Craftsman, and LiftMaster 1/3 and 1/2 HP chain drive garage door openers from 1984 onward. This comprehensive kit includes all necessary components and a detailed installation tutorial, ensuring durable, reliable performance and effortless DIY upgrades.

Specifications

ASIN	B07H4XYNPS
Amazon Bestseller	#351,044 in DIY, Tools & Garden ( See Top 100 in DIY, Tools & Garden ) #1,376 in Lawn Mower Parts & Accessories
Brand Name	TCK TECH
Customer Reviews	4.7 4.7 out of 5 stars (7,742)
Included Components	Liftmaster 41c4220a用ギアスプロケットキット交換用 x 1。
Manufacturer	TCK TECH
Model	54101-212542AT
Part Number	54101-212542AT

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Desertcart purchases this item on your behalf and handles shipping, customs, and support to Austria.

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