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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TCK TECH Replacement for Liftmaster 41c4220a Gear and Sprocket Kit fits Chamberlain Sears Craftsman 1/3 and 1/2 HP Chain Drive Models

TCK TECH Replacement for Liftmaster 41c4220a Gear and Sprocket Kit fits Chamberlain Sears Craftsman 1/3 and 1/2 HP Chain Drive Models

Product ID: 321690463

🔩Durable motor shaft & sprocket bearings

⚙️Precision gear & sprocket set

🛠️Complete installation tutorial included

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Description

⚙️ Upgrade your garage game — don’t get left behind!

DIY FRIENDLY - Step-by-step installation tutorial ensures quick, confident setup
ALL IN ONE REPAIR KIT - Includes gear, sprocket, worm gear, grease, and bearings for a hassle-free fix
COST EFFECTIVE UPGRADE - Restore your garage opener’s performance without the expense of a full replacement
SEAMLESS COMPATIBILITY - Fits Chamberlain, Sears, Craftsman & Liftmaster 1/3 & 1/2 HP chain drive models (1984-current)
LONG LASTING DURABILITY - Premium motor shaft and sprocket bearings engineered for smooth, reliable operation

The TCK TECH Replacement Gear and Sprocket Kit is a precision-engineered repair solution compatible with 1/3 and 1/2 HP chain drive garage door openers from Chamberlain, Sears, Craftsman, and Liftmaster (1984 to present). This comprehensive kit includes all essential components—gear, sprocket, worm gear, grease, and bearings—plus an easy-to-follow installation tutorial, enabling a cost-effective, durable fix that restores smooth operation and extends the life of your opener.

Specifications

ASIN	B07H4XYNPS
ASIN	B07H4XYNPS
Brand Name	TCK TECH
Customer Reviews	4.7 4.7 out of 5 stars (7,744)
Customer reviews	4.7 4.7 out of 5 stars (7,744)
Date First Available	3 October 2018
Is Discontinued By Manufacturer	No
Item model number	54101-212542AT
Manufacturer	TCK TECH
Manufacturer	TCK TECH
Model	54101-212542AT
Package Dimensions	15.39 x 11.61 x 11.51 cm; 481 g
Part Number	54101-212542AT

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$66.70

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Buyer Protection · Full refund if your order doesn't arrive as described.

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

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