Diesel Engines, Transmissions, and more

At Rocky Mountain Diesel & Auto, we know that depend on your vehicle. So when your diesel engine fails, or transmission starts giving you trouble, we are here to help. As an authorized Jasper dealer, we can repair your vehicle for significantly less than the cost of a new truck or motor. Our shop in Greeley, CO can have you up and running quickly, and at an affordable cost.

Jasper Engines & Transmissions

Every Jasper engine has been completely disassembled and completely cleaned before being re-manufactured. This attention to detail ensures your motor is free from contaminants that can lead to early engine failure. Every part we sell is thoroughly inspected for imperfections.

Quality Guaranteed

Jasper backs its quality engines and transmission with a limited nationwide warranty. You can buy with confidence, knowing that your components are warranted against defects in workmanship and material. For more information about Jasper’s warranties, click HERE.

Jasper Engines Logo - Diesel Service in Greeley, CO


Rocky Mountain Diesel Services offers a complete range of hitches, which are locally produced by Cody Hitch Products. These are extremely affordable and versatile so that they can be installed on most vehicles. Our most popular hitches include:

Cody Hitch - Diesel Equipment in Greeley, COTruck Hitch - Diesel Equipment in Greeley, COInstalled Truck Hitch - Diesel Hitches in Greeley, CO

Extra Heavy Duty Cody Universal Gooseneck Hitch

Fast easy steps allow this hitch to be bolted to the frame rails of your pickup with no cutting, welding, or bed removal required. This Cody Hitch is designed to be extremely rugged, with a 35,000 pound gross trailer weight and 7500 pound gross tongue weight rating that is achieved with a heavy DUAL/BOXED beam center section formed from ¼” steel plate. The Gooseneck Hitch is equipped with a simple patented reversible ball that can be changed from storage position to towing position by one simple 30 degree twisting action. It is this same twisting action that securely locks the ball in the latched position, thus eliminating any safety hazard. The “straight thru” design allows dirt and water to pass through, reducing freeze-up problems.

Cody Coupler

This coupler adapts 5th wheeler trailers to be towed by a vehicle with a gooseneck hitch. The Cody Coupler can be installed without any cutting, drilling or welding on the trailer. Attachment is done with two horse-shoe clamps and a set of screws. All pivot action is on the gooseneck ball. Using this self-latching coupler makes trailer hookup quick and easy to any truck with a gooseneck hitch. This hitch is
rated to 24,000 lbs. GVW (total truck and trailer).

Cody Cushion

This unique system allows owners to enjoy the ride qualities of an expensive air ride system, similar to that usually found on big rigs. This increases driver comfort by decreasing vibrations from road seams and bumps. The Cody Cushion also decreases the hammering action between the trailer and hitch, which saves wear and tear on your tow vehicle, trailer, and the hitch itself. This hitch mounts to your truck hitch so it works with every gooseneck trailer. This hitch can be fitted for most common hitches and is rated for up to 6000 lbs. vertical tongue weight.