What year is a 1st gen Dodge diesel?

The first generation of Dodge diesel trucks was introduced in 1989. These trucks were powered by a Cummins 5.9-liter inline six-cylinder diesel engine, which was a significant upgrade from the previous gasoline-powered engines used in Dodge trucks.

The Rise of Dodge Diesel Trucks

In the late 1980s, Dodge recognized the growing demand for more powerful and fuel-efficient trucks, particularly in the commercial and agricultural sectors. The introduction of the Cummins diesel engine in Dodge trucks was a game-changer, as it provided significantly more torque and towing capacity compared to the gasoline engines that had been the standard in the industry.

The first-generation Dodge diesel trucks, often referred to as the "Cummins Dodge," were available in various configurations, including the full-size Ram 150, 250, and 350 models. These trucks were known for their rugged design, impressive hauling capabilities, and reliable performance, which made them popular among farmers, construction workers, and other heavy-duty users.

Key Features of the 1st Gen Dodge Diesel

• Engine: Cummins 5.9-liter inline six-cylinder diesel engine, producing up to 160 horsepower and 400 lb-ft of torque.


• Transmission: Available with a five-speed manual or a four-speed automatic transmission.


• Towing Capacity: Significantly higher than previous Dodge gasoline-powered trucks, with a maximum towing capacity of up to 12,000 pounds.


• Durability: The Cummins diesel engine was known for its exceptional reliability and long service life, often lasting well over 300,000 miles with proper maintenance.

The introduction of the first-generation Dodge diesel trucks marked a significant milestone in the company's history and the evolution of the truck market as a whole. These rugged and capable vehicles paved the way for the continued success of Dodge's diesel-powered offerings in the years to come.

What year are 1st gen Cummins?

The "1st gen" Cummins engine, or 6BT5.9, was used in Dodge Ram trucks from model years 1989 through 1993. The first half of this period (1989-1991) had non-intercooled engines, while the later 1991.5-1993 models were intercooled, providing more power and efficiency. 

• 1989-1991: These early models were not intercooled and came with a 3-speed automatic transmission. 
• 1991.5-1993: Dodge added an air-to-air intercooler to the engine for improved performance. The automatic transmission was also upgraded to a 4-speed A518, which includes an overdrive unit. 

What year is 5.9 Cummins to avoid?

You should avoid 5.9 Cummins years with known weaknesses, specifically 1998.5–2002 (due to the unreliable VP44 injection pump and potential lift pump failure) and 1999–2001 (due to the "53 block" casting, which is prone to cracking). While other years may have specific issues, these are the most frequently cited for potential major failures. 
Specific years and common problems to avoid:

• 1999–2001: These are the most critical years to avoid due to the "53 block" casting with thin water jacket walls that can lead to cracking and coolant leaks. 
• 1998.5–2002: These models use the Bosch VP44 injection pump, which is prone to failure. A failure in the lift pump that feeds the injection pump can cause a chain reaction, leading to the expensive VP44 failing as well. 
• 2004.5–2005: These models have injectors that were more prone to premature wear, which can lead to rough starts, smoke, or fuel in the oil. 

Other considerations:

• Transmission: The 47RE automatic transmission, found in 1994-2002 trucks, is a weak point due to its older design and smaller components. 
• 1998: This year is a bit of a transition year, but can still have the VP44 injection pump issues mentioned above. 

Years considered more reliable:

• 1994–1998: These 12-valve engines are highly reliable due to their mechanical P7100 injection pump.
• 2006–2007: The last of the 5.9L common rail engines are considered by some to be the peak of 5.9L performance before the introduction of the 6.7L. 

How much is a 1st gen Cummins worth?

A first-generation Cummins truck can be worth anywhere from around $5,000 for a project or high-mileage truck to over $40,000 for a pristine, low-mileage example. Key factors like the condition, mileage, drivetrain (4x4 vs. 2WD), and whether it's an intercooled model significantly affect the value, with the average price landing in the mid-$20,000s according to Classic.com.
 
Factors that influence the price

• Condition: A rust-free truck in good mechanical shape will command a much higher price. 
• Mileage: Trucks with lower mileage (under 150k) are more valuable. 
• Drivetrain: 4x4 models are generally worth more than 2WD models. 
• Year and Features:
  • Models from 1991-1993 are more desirable because they are intercooled and have a four-speed automatic transmission option. 
  • A 5-speed manual transmission is also a plus. 
• Rarity: Low-mileage, well-optioned examples are rare and can sell for a premium. 

Examples of values

• $5,000: For a truck that runs and drives but has mechanical issues or significant rust. 
• $6,500–$10,000: For a truck with 150k–200k miles in decent running condition. 
• $15,000–$40,000: For high-end, rust-free, well-maintained trucks, with prices approaching the higher end for exceptional examples. 
• $165,000: The highest recorded sale price was for a rare 1991 Dodge D200 Custom 6-Wheeler on January 18, 2025, as shown on Classic.com. 

What to look for

• Mechanical condition: Check for common issues like fuel system problems and transmission wear. 
• Rust: Inspect for rust, especially in the body and frame, which can be a major expense to repair. 
• Service history: A documented history of maintenance can increase a truck's value. 

What is the best year of the first gen Cummins?

The best first-gen Cummins years are generally considered to be 1991.5 through 1993 because these models came with a factory intercooler and an overdrive transmission, which improved power and fuel economy, Diesel Army. While 1989–1991 models are also reliable, they are non-intercooled and use a 3-speed automatic or 5-speed manual, making the later years preferable for highway driving, says this YouTube video.
 
You can watch this video to learn more about the features of the first-gen Cummins: 58sHakosanYouTube · Oct 1, 2023
1991.5–1993 (Intercooled) 

• Advantages: These years are the most sought-after due to the factory-installed intercooler and the 4-speed automatic or 5-speed manual transmission with an overdrive gear for better highway cruising. 
• Engine: 12-valve, fully mechanical, 5.9L turbo diesel engine. 
• Transmission: The 518 automatic was upgraded to include an overdrive gear, and the Getrag G360 5-speed manual transmission is considered a strong option. 

1989–1991 (Non-Intercooled) 

• Advantages: These are the original models and are still very reliable and easy to work on. 
• Engine: 12-valve, fully mechanical, 5.9L turbo diesel engine. 
• Transmission: They came with a 3-speed automatic or a 5-speed manual transmission without an overdrive gear.