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Trim Sender/Sending Unit – Fits OMC Cobra 1986-1993 (Replaces 984748, 3850470)
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Trim Sender/Sending Unit – Fits OMC Cobra 1986-1993 (Replaces 984748, 3850470)
This trim sending unit is a reliable replacement for OMC Cobra sterndrives manufactured between 1986 and 1993. It is also compatible with Volvo Penta SX and SX-series drives, ensuring accurate trim-level readings on your vessel's gauges.
Engineered to meet or exceed original equipment specifications, this part serves as a direct replacement for several OEM and aftermarket part numbers, restoring proper functionality to your power trim system.
- Installation Type: Direct bolt-in replacement
- Electrical Connection: 2-wire connector
- Primary Materials: Durable aluminum and plastic composite housing
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| OMC | 984748 |
| OMC | 3850470 |
| Volvo Penta | 0984731 |
| Volvo Penta | 0983939 |
| Sierra | 18-7634 |
Compatible Engine Models
Confirm your engine model/year in the table below.
OMC Cobra Models
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| OMC | Cobra | 2.3L | 4-Stroke | 1986-1993 | 984748 |
| OMC | Cobra | 2.5L | 4-Stroke | 1986-1993 | 984748 |
| OMC | Cobra | 3.0L | 4-Stroke | 1986-1993 | 984748 |
| OMC | Cobra | 4.3L | 4-Stroke | 1986-1993 | 984748 |
| OMC | Cobra | 5.0L | 4-Stroke | 1986-1993 | 984748 |
| OMC | Cobra | 5.7L | 4-Stroke | 1986-1993 | 984748 |
| OMC | Cobra | 5.8L | 4-Stroke | 1986-1993 | 984748 |
| OMC | Cobra | 7.5L | 4-Stroke | 1986-1993 | 984748 |
Volvo Penta Models
| Brand | Model | Years | OEM Part No. |
|---|---|---|---|
| Volvo Penta | SX | Compatible | 0983939 |
| Volvo Penta | SX-S | Compatible | 0984731 |
| Volvo Penta | SX-SLT | Compatible | 0984731 |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Trim Sending Unit |
| Installation | Direct bolt-in replacement |
| Connection | 2-wire electrical |
| Housing Material | Aluminum/Plastic Composite |
| Dimensions | ~13.2 cm x 8.9 cm x 5.1 cm (5.2 x 3.5 x 2 inches) |
| Weight | ~0.12 kg (4.23 ounces) |
| Wire Length | ~95 cm (37.4 inches) |
| Operating Temperature | -20°C to 80°C (-4°F to 176°F) |
| Warranty | 1 Year |
Package Contents
- 1 x Trim Sending Unit (Replaces 984748/3850470)
Explosion Diagram
Installation Guide
- Safety First: Disconnect the boat's battery before beginning work to prevent electrical shorts.
- Locate the Sender: Identify the old trim sender, typically mounted on the transom assembly near the gimbal ring.
- Disconnect Wiring: Carefully unplug the 2-wire electrical connector leading to the old unit.
- Remove Old Unit: Unscrew the mounting hardware holding the old sender in place and remove it from the sterndrive.
- Install New Sender: Position the new sending unit, ensuring it is correctly aligned. Secure it using the original mounting hardware.
- Reconnect and Test: Plug in the new electrical connector, reconnect the battery, and test the trim gauge for correct operation.
Troubleshooting & FAQ
Q: How can I confirm this part fits my sterndrive?
A: This unit is confirmed to fit OMC Cobra models from 1986-1993 and is also compatible with many Volvo Penta SX drives. The best way to ensure fitment is to check that your engine model is listed in the compatibility tables and that your original part's number matches one of the cross-references listed: OMC 984748/3850470, Sierra 18-7634, or Volvo Penta 0984731/0983939.
Q: What are the main signs that my trim sender is failing?
A: The most common symptoms are an erratic or completely non-functional trim gauge on your dashboard. You might notice the needle jumping, not moving at all, or being stuck in the fully up or down position regardless of the drive's actual tilt angle.
Q: How difficult is the installation?
A: This unit is designed as a direct bolt-in replacement with a standard 2-wire connector, making the installation straightforward for those with basic mechanical skills. However, as it involves the boat's electrical system, professional installation is always recommended to ensure safety and proper function.
Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.
Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.
Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.
Important Notes
- Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
- This product is an aftermarket replacement part and is not an OEM component.
- Professional installation is recommended to ensure safety and optimal performance.
Why Choose JLM MARINE?
- Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
- Fast Global Shipping: Free delivery worldwide in 5–15 days.
- Direct from Manufacturer: Competitive pricing without compromising quality.
We can ship to virtually any address in the world with free shipping available for most regions.
For our typical US and Canadian customers , our shipping timeframes are as follows:
- Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
- US warehouse shipment: orders will be delivered within 5 days after placing the order.
- China warehouse shipment: orders will be delivered about 12 days after placing the order.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.
As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.
We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.
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