The ROP Shop replacement Drive Gear Kit for 3/4HP Chamberlain Garage Door Opener Manufacture 1984-Current Specs - Drive Gear Bore Size (Inner Diameter): 1/2". Drive Gear Outside Diameter: 2 3/4". Drive Gear Number of Teeth: 32. Worm Gear Length: 2 1/8". Worm Gear Diameter: 1 1/8". Worm Gear Shaft Hole: 1/2". Refer to images 2 & 3 for more information Includes - (1) Drive Gear, (1) Worm Gear, (1) Bushing, (2) Roll Pins, (1) Grease Lubricant & Fittings; comes as shown in the first image Fits Chamberlain garage door chain & belt drive openers 1/3 HP, 1/2 HP, 3/4 HP manufactured from 1984 to present Fits Wayne Dalton garage door opener 100-320 models

Drive Gear Kit for 3/4HP Chamberlain Garage Door Opener Manufacture 1984-Current Please review all product information to ensure that this product is compatible with your unit. A Message to the Customer The ROP Shop staff constantly strives to provide clear and concise product information. We understand that sometimes it can be difficult to confirm product compatibility. It is your responsibility to confirm this is the correct product you need; therefore, we encourage all customers to fully review the information provided in this listing prior to purchase. Nothing is worse than having to return a product, trust us…we get it. Let’s work together to avoid this! If you are unsure as to whether or not this is the correct product for your unit, please ask. If you seek assistance we will need as much of the following information as possible , if applicable, to help you find the product you are looking for: Model and/or Sub-model Spec and/or Type Number Code and/or Serial Number Year Engine Horsepower Our knowledgeable product specialists are always willing to help you verify product fitment. Stay rugged, my friend. -The ROP Shop Staff