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

Product ID: 321690463

🔧Fits 1/3 & 1/2 HP chain drive models

⚙️Precision-engineered gear & sprocket

🛠️Complete installation tutorial included

₩140639

Duties & taxes included

In stock

Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚙️ Upgrade your garage game with precision and ease!

DIY FRIENDLY - Step-by-step installation tutorial ensures quick, confident setup without a pro
ALL IN ONE KIT - Includes gear, sprocket, worm gear, grease, and bearings for a hassle-free replacement
DURABLE PERFORMANCE - High-quality materials engineered to extend the life of your garage door opener
TRUSTED BY THOUSANDS - Rated 4.7 stars by over 7,800 users who upgraded their garage door reliability
SEAMLESS COMPATIBILITY - Works flawlessly with Chamberlain, Sears, Craftsman & LiftMaster chain drive openers (1984-current)

The TCK TECH Replacement Gear and Sprocket Kit is a comprehensive, durable solution designed for 1/3 and 1/2 HP chain drive garage door openers from LiftMaster, Chamberlain, Sears, and Craftsman (models from 1984 to present). This kit includes all essential components plus a detailed installation tutorial, making it the go-to choice for professionals and DIY enthusiasts aiming to restore smooth, reliable garage door operation.

Specifications

ASIN	B07H4XYNPS
ASIN	B07H4XYNPS
Batteries Included?	No
Batteries Required?	No
Color	1
Customer Reviews	4.7 4.7 out of 5 stars (7,874)
Customer reviews	4.7 4.7 out of 5 stars (7,874)
Date First Available	3 October 2018
Date First Available	3 October 2018
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Item Weight	481 g
Item model number	54101-212542AT
Item model number	54101-212542AT
Manufacturer	TCK TECH
Manufacturer	TCK TECH
Package Dimensions	15.39 x 11.61 x 11.51 cm; 481 g
Package Dimensions	15.39 x 11.61 x 11.51 cm; 481 g
Part number	54101-212542AT
Size	1

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