does this all come assembled like shown in photo

Yes, it comes just like shown in the picture.

Is the grease for the synthetic gears as well as the metal gear?

If I remember correctly the grease was for the synthetic gears. I would do a Google search for part # 41C4220A. That's were I found a link to a YouTube video that demonstrated how to repair your garage door motor using this kit.

From 1 through 3 how easy is it to replace those parts from the original unit, 3 means you need to hire a contractor.

If you have any mechanical ability and can follow written directions, I would rate it an easy 1. You can also get help on line from several DIY web sites. Just don't tighten the chain/cord too tight. It needs to sag about 1/2 to 5/8 inch, in my opinion.

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41C4220A LiftMaster Gear & Sprocket Assembly Kit

Product ID: 13175818

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🔗Fits 1/3 & 1/2 HP chain drives

⚙️Complete gear & sprocket kit

🛠️DIY-friendly assembly

Description

⚙️ Upgrade your garage game with the ultimate gear kit!

COMPACT LIGHTWEIGHT - Just 1 lb and 5x5x5 inches—perfect for quick shipping and easy handling
EFFORTLESS DIY UPGRADE - Clear instructions and removable parts make installation a breeze for busy pros
UNIVERSAL COMPATIBILITY - Fits Chamberlain, Sears, Craftsman & LiftMaster chain drive models from 1984 onward
ALL IN ONE PRECISION KIT - Includes gear, sprocket, worm gear, grease & bearings for seamless replacement
OEM CERTIFIED AUTHENTICITY - 100% genuine LiftMaster parts ensure peak performance and durability

The 41C4220A LiftMaster Gear & Sprocket Assembly Kit is a genuine OEM replacement set designed for 1/3 and 1/2 HP chain drive garage door openers from Chamberlain, Sears, Craftsman, and LiftMaster. It includes all essential components—gear, sprocket, worm gear, grease, and bearings—packaged for easy DIY installation, ensuring reliable, long-lasting performance.

Specifications

Manufacturer	Chamberlain
Brand	CHAMBERLAIN
Model	41c4220a
Item Weight	1 pounds
Product Dimensions	5 x 5 x 5 inches
Item model number	41c4220a
Is Discontinued By Manufacturer	No
Manufacturer Part Number	41c4220a
Special Features	Removable

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