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2003 - 2008 Dodge Ram 1500
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We know our products
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Complete CURT Class 5 2-1/2" trailer hitch and 5-flat wiring kit (with 4-way to 5-way adapter for surge brakes) engineered for the 2003 - 2008 Dodge Ram 1500 Will not fit with factory receiver (built in or after 11/02). Vehicle-specific fit, plug-and-play installation, all hardware and instructions included.
This custom kit fits the following vehicles:
All Hardware and Installation Instructions Included!
In the world of commercial towing, more is expected. A job cannot be completed if the equipment cannot handle the workload. That is why CURT developed the Commercial Duty class 5 trailer hitch. Constructed from steel and engineered for power, these class 5 hitches are designed to complement the towing power of full-size, commercial pickup trucks, including diesels and chassis cabs. They can easily handle a variety of oversize trailers, including toy and car haulers, livestock trailers, dumper trailers, large flatbed trailers, large boat trailers and more (NOTE: Never exceed the lowest weight capacity of any towing component). This particular class 5 hitch features a gross trailer weight capacity of 18,000 lbs. and a tongue weight capacity of 2,700 lbs. It is designed to be a custom trailer hitch for certain years of the Dodge Ram 1500, 2500 and 3500 (to verify your vehicle compatibility, see application info). All CURT Commercial Duty class 5 hitches feature a 2-1/2" x 2-1/2" receiver tube opening to accept the strongest of ball mounts and towing accessories. They are perfect for mounting standard ball mounts, pintle mounts, tow hooks and weight distribution hitches as well as winch mounts and cargo carriers. CURT class 5 tow hitches are protected by a co-curing of liquid A-coat and carbide black powder coat finish. They also mount with grade-8 hardware, included with each hitch.
If your vehicle is not equipped with wiring for towing a trailer, CURT custom wiring is the ideal solution. A custom wiring harness -- also called a T-connector -- is a simple, plug-and-play electrical device that plugs into your automotive electric system and provides a standard, universal trailer wiring connection. This is done using two or more vehicle-specific, OEM-compatible connectors to plug into the taillight assembly, eliminating the need for cutting, splicing and soldering during installation. Custom wiring harnesses are made vehicle-specific, and while they are not available for all vehicles, they do offer one of the fastest, easiest and most secure ways to wire a vehicle for towing. This particular plug-in harness provides a 4-way flat connector socket and is designed to be a custom wiring harness to fit certain years of the Dodge Ram 1500, 2500 and 3500 (to verify your vehicle compatibility, see application info). It comes with all necessary wiring components to establish a reliable trailer wiring connection, as well as a dust cover to keep the connector clean when not in use. You have a picture in mind of your next destination -- maybe it's the boat landing at your favorite fishing spot, maybe it's a campsite that overlooks one of nature's masterpieces, or maybe it's the next big jobsite. However, turning that picture into a reality takes more than just daydreaming. It takes a solid connection and the right amount of power. CURT custom wiring is made with some of the most sophisticated technology in the industry and is designed to install with ease, giving you a long-lasting electrical connection for your towing hitch setup.
CURT offers a variety of high-quality trailer hitches and accessories for select vehicle models. Find the perfect fit for your towing needs at TowUniverse.
CURT, a Lippert brand, offers a complete line of towing products and is the leading manufacturer of custom-fit trailer hitches. We offer the broadest selection of custom-fit hitches, and each one is designed, welded, and coated in Wisconsin.
CURT is also a leader in flat towing products, as well as 5th wheel, gooseneck, and weight distribution hitches, ball mounts, electrical components, cargo solutions, and other towing accessories.
For everything from passenger cars and vans to full-size pickups and SUVs, CURT is 'The First Name in Towing Products®.'
Experts available to answer your questions
Call 888-634-94941 compatible vehicles
| Year | Make & Model | Notes |
|---|---|---|
| 2003 - 2008 | Dodge Ram 1500 | Will not fit with factory receiver (built in or after 11/02) |
Yes, the Curt 15704 is designed for 03-current Dodge Ram 2500/3500 models without an OEM receiver hitch. Confirm your vehicle does not have a factory-installed receiver hitch before purchasing. If your truck has a factory hitch, you may need to loosen and push it toward the rear to create space for the CURT hitch installation.
Yes, the Curt 15704 fits 03-08 Dodge Ram 1500 models built after November 2002, provided your vehicle does not have an OEM receiver hitch. Vehicles built before November 2002 are not compatible with this hitch.
Yes, the 15704 is designed for both short bed and long bed configurations. Installation differs by bed length: long bed vehicles use the front-most hole on the hitch side plates, while short bed vehicles use the middle hole. The correct spacers and hardware are included for both configurations.
The Curt 15704 has a gross load capacity of 18,000 lbs trailer weight and 2,700 lbs tongue weight when used as a weight carrying hitch. The same capacity applies when used as a weight distribution hitch: 18,000 lbs trailer weight and 2,700 lbs tongue weight. Do not exceed your vehicle manufacturer's recommended towing capacity.
The Curt 15704 hitch weighs 60 lbs.
You will need: a socket wrench, a torque wrench, an 8 inch socket extension, and 13/16" and 7/8" sockets. These tools are required to properly install and torque all fasteners to specification.
The kit includes: 2 HHCS 9/16-12 UNC Grade 8 bolts (part 10-10500), 2 pieces of 9/16" fishwire, 2 flat washers 9/16" (part 30-00202), 6 serrated flange nuts 9/16-12 UNC Grade 8 (part 20-00104), 4 carriage bolts 9/16-12 UNC 1-3/4" Grade 8 (part 10-10328), 2 spacers .313 x 2.13 x 2.13" with 9/16" square hole (CM-SP68), 2 spacers .313 x 1.50 x 3.00" with 9/16" square hole (CM-SP74), and 6 spacers .188 x 1.25 x 1.50" with round holes (CM-SP8).
No, drilling is not required. The hitch uses existing holes in the vehicle frame rails and bumper beam. All mounting points align with factory holes.
Professional installation takes approximately 60 minutes. DIY installation for a novice takes approximately 77 minutes.
Fishwire is a flexible wire used to route carriage bolts through tight spaces where a bolt cannot be inserted directly. In this installation, fishwire is used to thread 9/16" carriage bolts through access holes in the frame rails and through the spacers. The fishwire guides the bolt through the hole, then is removed once the bolt is in position. Refer to the FISHWIRE TECHNIQUE diagram on the manual for the specific routing.
The manual does not explicitly state whether bumper removal is required. However, installation steps reference fishwiring bolts through the bumper beam and accessing frame rails, which may require bumper loosening or removal. If your vehicle has a factory hitch, you may need to loosen the hitch and bumper beam and push it toward the rear to create space for the CURT hitch.
For long bed vehicles, use the front-most hole on the hitch side plates for both the front and rear mounting points. Short bed vehicles use the middle hole instead.
For short bed vehicles, use the middle hole on the hitch side plates for both the front and rear mounting points. Long bed vehicles use the front-most hole instead.
The CM-SP74 spacers (.313 x 1.50 x 3.00" with 9/16" square hole) are installed at the front mounting holes. Slide these spacers through the ends of the frame rails and align their holes with the front mounting holes on the hitch side plates.
The CM-SP68 spacers (.313 x 2.13 x 2.13" with 9/16" square hole) are installed at the rear mounting holes. Slide these spacers through the ends of the frame rails and align their holes with the rear mounting holes on the hitch side plates.
The CM-SP8 spacers (.188 x 1.25 x 1.50" with round holes) are installed between the tow loops and hitch side plates. Use enough spacers to prevent the tow loops from pulling into the hitch when the hex bolts are tightened. These spacers maintain proper clearance and alignment.
For 1500 models, use the bottom slot on the hitch side plate when aligning with the vehicle tow loops. 2500/3500 models use the top slot instead.
For 2500/3500 models, use the top slot on the hitch side plate when aligning with the vehicle tow loops. 1500 models use the bottom slot instead.
All 9/16" fasteners on the Curt 15704 are torqued to 150 lb-ft. This includes the carriage bolts installed in steps 4-5 and the hex bolts installed in steps 8-10. Use a torque wrench to ensure proper tightness.
Do not exceed your vehicle manufacturer's recommended towing capacity. While the Curt 15704 is rated for 18,000 lbs trailer weight and 2,700 lbs tongue weight, your vehicle's manufacturer may specify a lower limit. Always follow the more conservative specification.
After installation, verify that all fasteners are tight and all structural components are sound. Periodically check the hitch during use to ensure fasteners remain tight and the hitch shows no signs of damage or wear.
Periodically check the receiver hitch to ensure that all fasteners are tight and that all structural components are sound. The manual does not specify an exact interval, but regular inspection before towing is recommended.
Yes, the 15704 fits 03-current Ram 2500/3500 and 03-08 Ram 1500 (built after Nov. 2002) without factory receivers. Confirm your truck has no OEM hitch before purchasing.
18,000 lbs trailer weight and 2,700 lbs tongue weight. Do not exceed your vehicle manufacturer's recommended towing capacity.
No drilling required. The hitch uses existing factory holes in the frame rails and bumper beam.
Socket wrench, torque wrench, 8 inch socket extension, and 13/16" and 7/8" sockets.
All 9/16" fasteners are torqued to 150 lb-ft using a torque wrench.
Professional installation: 60 minutes. DIY installation: 77 minutes.
Yes. Long bed vehicles use the front-most hole on hitch side plates; short bed vehicles use the middle hole.
Yes, Curt part number 55504 is designed for Dodge Ram 1500, Dodge Ram 2500, and Dodge Ram 3500 models. The installation uses the vehicle's existing taillight wiring harness in positions T3 and T5.
The Curt 55504 is a T-connector trailer wiring harness that taps into your vehicle's existing taillight wiring. It includes a converter box, a 4-flat connector for the trailer, and wiring with yellow and green leads for the driver and passenger sides respectively.
The kit includes a T-connector with yellow and green wires, a black converter box, a white ground wire with eyelet and screw, double-sided tape, cable ties, and a 4-flat connector. You will need a drill with a 3/32" bit if no suitable existing screw is available for grounding.
The manual does not specify whether the battery must be disconnected. Contact Curt Manufacturing or your installer for this safety requirement before beginning work.
Locate the vehicle's taillight wiring harness in positions T3 and T5 under the vehicle. The harness will have connectors similar to those on the T-connector included in the kit.
On the driver's side, separate the vehicle's taillight connectors without damaging the locking tabs. Insert the T-connector end with the yellow wire between the separated connectors, ensuring they are fully inserted with locking tabs in place. Repeat on the passenger's side using the green wire T-connector end.
Route the T-connector end with the green wire under the vehicle to the passenger's side taillight wiring harness. Avoid any location that may pinch or cut the wire during routing.
Locate a suitable grounding point near the connector, such as an existing screw with nut in the vehicle's frame. If no existing screw is available, drill a 3/32" hole and secure the white wire using the eyelet and screw provided in the kit. Before drilling, verify that no miscellaneous items are hidden behind or under the surface to avoid damage or personal injury.
Drilling is required only if no suitable existing screw with nut is available on the vehicle's frame for grounding the white wire. If drilling is necessary, use a 3/32" drill bit. Always verify that no miscellaneous items are hidden behind or under any surface before drilling to avoid damage and personal injury.
Drill a 3/32" hole if no existing screw is available on the vehicle's frame for grounding the white wire.
Adhere the black converter box to the frame of the vehicle using the double-sided tape provided in the kit.
Secure any loose parts of the T-connector with the cable ties provided in the kit.
Route the 4-flat connector to the center of the vehicle and secure it in a convenient out-of-the-way location.
Before drilling, verify that miscellaneous items are not hidden behind or under any surface. Drilling without checking can cause damage to hidden components and personal injury.
Avoid any location that may pinch or cut the wire when routing the T-connector under the vehicle. Also, do not damage the locking tabs on the vehicle's connectors when separating them.
Yes, the Curt 55504 is designed for Dodge Ram 1500, 2500, and 3500 models.
You need a drill with a 3/32" bit only if no existing screw is available on the vehicle frame for grounding. All other hardware is included.
Drilling is optional and only needed if no existing screw with nut is available on the vehicle frame for the ground wire. If drilling is required, use a 3/32" bit.
Before drilling, verify that no miscellaneous items are hidden behind or under the surface to avoid damage and personal injury.
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