Universal Joint Assembly – Fits MerCruiser/Mercury Bravo and Blackhawk Drives (Replaces 864244A2)
Universal Joint Assembly – Fits MerCruiser/Mercury Bravo and Blackhawk Drives (Replaces 864244A2) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Universal Joint Assembly – Fits MerCruiser/Mercury Bravo and Blackh...
Product Details
This Universal Joint Assembly is an essential drivetrain component designed to fit MerCruiser/Mercury Bravo I, II, and III drives from 1988 onwards, as well as Blackhawk drives from 1994–1995. It directly connects the upper and lower units, ensuring smooth power transmission from the engine to the propeller.
It serves as a direct replacement for multiple OEM and aftermarket part numbers, including Mercury/MerCruiser 864244A2 and 12784A10, Sierra 18-6401, GLM 28090, and EMP 94-04820.
- Engineered for Bravo and Blackhawk sterndrive applications.
- Used in the drive shaft assembly connecting the upper and lower units.
- Constructed from durable metal alloys for longevity.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury/MerCruiser | 864244A2 |
| Mercury/MerCruiser | 12784A10 |
| Sierra | 18-6401 |
| GLM | 28090 |
| EMP | 94-04820 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser models, please verify your drive's serial number to ensure correct fitment as specified in the notes.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | Bravo I | Various | Various | 1988–2002 | 864244A2 | Serial #: 0B664190–0M111207 |
| MerCruiser | Bravo I | Various | Various | 2002+ | 864244A2 | Serial #: 0M111208 and up |
| MerCruiser | Bravo II | Various | Various | 1988–2002 | 864244A2 | Serial #: 0B664190–0M111207 |
| MerCruiser | Bravo II | Various | Various | 2002+ | 864244A2 | Serial #: 0M111208 and up |
| MerCruiser | Bravo III | Various | Various | 1988–2002 | 864244A2 | Serial #: 0B664190–0M111207 |
| MerCruiser | Bravo III | Various | Various | 2002+ | 864244A2 | Serial #: 0M111208 and up |
| MerCruiser | Blackhawk | Various | Various | 1994–1995 | 864244A2 | Serial #: 0F186717 and up |
Technical Specs
- Product Type
- Universal Joint Assembly
- Installation
- Bravo and Blackhawk Drives
- Housing Material
- Metal (Steel/Alloy)
- Dimensions
- 51.5" L x 11.0" W x 11.5" H
- Weight
- 11.25 lb (5.1 kg)
- Other Technical Attributes
- Used in drive shaft assembly connecting upper and lower units
What’s in the Box
- 1 x Universal Joint Assembly (replaces 864244A2/12784A10)
Installation Notes
- Ensure the engine is off and the battery is disconnected before starting.
- Drain the sterndrive gear lube completely.
- Carefully separate the upper and lower units of the sterndrive.
- Remove the retaining clips or bolts and press out the old universal joint assembly.
- Thoroughly clean the yoke and drive shaft surfaces, checking for any wear or damage.
- Install the new universal joint assembly, ensuring caps are properly seated and aligned.
- Secure the new assembly with the provided clips or hardware.
- Rejoin the upper and lower sterndrive units, using new gaskets or seals as required.
- Refill the sterndrive with the manufacturer-recommended gear lube to the correct level.
- Reconnect the battery and test for smooth operation on the water.
Troubleshooting & FAQ
How do I confirm this fits my specific MerCruiser drive?
Fitment depends on the serial number. This part fits Bravo drives with serial numbers 0B664190–0M111207 (1988-2002) and 0M111208 and up (2002+), and Blackhawk drives with serial number 0F186717 and up (1994-1995). Always check your drive's serial number before ordering.
What are common signs of a failing U-joint?
Symptoms of a worn or failing universal joint include excessive vibration, especially when turning or accelerating; clunking sounds from the stern drive area; or visible rust, corrosion, or looseness in the joint itself.
Is any special grease required for this U-joint?
Yes, always use a high-quality marine-grade grease specified for U-joints and sterndrive applications. Refer to your service manual for the exact lubricant type and greasing intervals to ensure maximum life.
Can I replace just one part of the U-joint assembly?
This part is sold as a complete assembly. Attempting to replace individual components is not recommended, as it is a balanced part critical to drivetrain integrity. For safety and performance, always replace the entire unit.
How often should the U-joints be inspected?
U-joints should be inspected annually as part of your regular sterndrive maintenance routine. Check for play, noise, or signs of water intrusion. Replace the assembly if any wear or damage is found.
What is the difference between an OEM and an aftermarket part?
This listing is for an aftermarket replacement, not an original equipment manufacturer (OEM) component. It is built to meet or exceed OEM-level specifications using comparable materials. Our parts are manufactured in an ISO 9002 certified facility and are batch-inspected to ensure quality and consistency.
How fast is shipping and what does it cost?
We ship worldwide quickly, with a typical transit time of 5–15 days. Standard shipping is free for most orders. Expedited shipping options and exact costs are available at checkout.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use conditions. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard return window for items that are unused and in their original condition. See our policy page or reach out for detailed instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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