My Account
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order

Sierra 18-6399 Shaft & Stub Assembly for OMC Cobra Sterndrive

Manufacturer

Picture for manufacturer Sierra

Part Number

18-6399
12 reviews
Sale Price

$327.26

1 left at this price

delivery box

Usually delivered within 2 days

free shipping

FREE SHIPPING

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Sierra 18-6399 Shaft & Stub Assembly is a heavy-duty replacement component engineered for OMC Cobra stern drives. Designed as a direct replacement for OEM part number 984264, this assembly restores proper drivetrain function to your sterndrive system and is built to Sierra's marine-grade quality standards.

Sierra International, now a Dometic Marine brand, is a trusted name in aftermarket marine parts, offering products that meet or exceed original equipment specifications. The 18-6399 combines the water pump shaft and stub shaft into a single serviceable assembly, simplifying the replacement process.

Key Features:

  • Heavy-duty construction for reliable performance in marine environments
  • Direct replacement for OMC OEM part number 984264
  • Includes straight grease fitting and 90° fitting for proper lubrication
  • Combines stub shaft and water pump shaft in one assembly
  • Compatible with OMC Cobra and King Cobra stern drives
  • Cross-references: GLM 28320, Mallory 9-72202

OEM & Cross-Reference Part Numbers:

  • OEM Replaces: OMC 984264
  • GLM: 28320
  • Mallory: 9-72202

Backed by Sierra's limited lifetime warranty against defects in workmanship and materials, the 18-6399 is a dependable choice for restoring your OMC Cobra sterndrive to proper operating condition.

Great experience so far

Very good and easy experience! Items shipped out quickly. Definitely will do future business here.

Great website. Easy to find my needed part and the checkout process, using Amazon, was fabulous.

Had my product in stock and ready to go. Ordered it at about 1 p.m. eastern time and got an email saying it was shipped out a couple hours later. Can't beat that! Lowest prices I've seen and has plenty of products to choose from. I will be recommending Autoplicity to everyone and anyone.

Easy to navigate website.

easy enough- looks like quality web site

great experience, good price, item arrived within 4 days of purchase, would do business with again in future !

easy

Very quick and easy to order. Looking forward to the speedy delivery :)

Great and easy to order.

tried to order a gasket with my exhaust pipe, shipping jumped12 just for gasket!! Not happening!!

Fast shipping. Autoplicity has the best pricing I can find. <br>Very happie.

Share icon
Return Policy
Returns are easy at Boatplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy