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

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

Product ID: 92620807

🔧Fits 1/3 & 1/2 HP chain drive models

⚙️Complete gear & sprocket kit

🛠️Easy step-by-step installation

€ 56.34

Duties & taxes included

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Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚙️ Upgrade your garage door game with precision & ease!

TRUSTED BY THOUSANDS - Top-rated (#1 in Garage Door Gears) with 4.7-star reviews from over 8,000 users
EFFORTLESS INSTALLATION - No output shaft disassembly needed—spur gear pre-mounted for quick setup
UNIVERSAL COMPATIBILITY - Perfect fit for Chamberlain, Sears, Craftsman & LiftMaster chain drive operators (1984-current)
ALL IN ONE PRECISION KIT - Includes gear, sprocket, worm gear, grease & bearings for seamless replacement
DURABILITY MEETS PERFORMANCE - Engineered to restore smooth, reliable garage door operation every time

This Replacement Gear and Sprocket Kit (model 41c4220a) is a comprehensive, easy-to-install solution designed for 1/3 and 1/2 HP chain drive garage door openers by LiftMaster, Chamberlain, Sears, and Craftsman. Featuring all necessary components pre-assembled for faster installation, it ensures durable, smooth operation and is backed by thousands of positive reviews, making it the go-to choice for reliable garage door maintenance.

Specifications

ASIN	B07H4XYNPS
Best Sellers Rank	#5,326 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1 in Garage Door Gears
Color	1x Gear & Sprocket Kit
Customer Reviews	4.7 4.7 out of 5 stars (8,197)
Date First Available	September 6, 2018
Included Components	1x Gear Sprocket Kit Replacement for Liftmaster 41c4220a
Item Package Quantity	1
Item Weight	1.06 pounds
Item model number	54101-212542AT
Manufacturer	TCK TECH
Package Dimensions	6.06 x 4.57 x 4.53 inches
Part Number	54101-212542AT

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