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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⚙️ Upgrade your garage game with precision power and effortless DIY!

DIY FRIENDLY - Step-by-step installation tutorial included to get you back on track without a pro
ALL IN ONE KIT - Includes gear, pinion motor shaft, worm, grease, ball & pinion bearings for a full upgrade
TIMELESS RELIABILITY - Supports chain disc operators manufactured from 1984 to current—future-proof your garage
SEAMLESS COMPATIBILITY - Fits Chamberlain, Sears, Artisan & LiftMaster 1/3 & 1/2 HP chain drive models effortlessly
DURABILITY MEETS PERFORMANCE - High-quality aftermarket parts designed to restore smooth, reliable garage door operation

This Replacement Liftmaster 41 C4220A Gear and Sprocket Kit by TCK TECH is a premium aftermarket solution engineered for Chamberlain, Sears, Artisan, and LiftMaster 1/3 and 1/2 HP chain drive garage door openers. The kit includes all essential components—gear, pinion motor shaft, worm, grease, and bearings—ensuring a comprehensive repair or upgrade. Compatible with models dating back to 1984, it comes with an easy-to-follow installation tutorial, empowering professionals and DIY enthusiasts alike to restore smooth, reliable garage door performance.

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Manufacturer	TCK TECH
Part Number	54101-212542AT
Package Dimensions	15.39 x 11.61 x 11.51 cm; 481 g
Item model number	54101-212542AT
Colour	1
Item Package Quantity	1
Batteries included?	No
Batteries Required?	No
Item Weight	481 g

Replacement for Liftmaster 41 C4220A Gear and Sprocket Kit Compatible with Chamberlain, Sears, Craft 1/3 and 1/2 HP Chain Drive Models 1

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