2nd Gen Cummins: Upgraded Auto Transmission and Other Fixes

Cummins has been into providing heavy-duty pick-up trucks since 2007 and has never failed to satisfy its audience with its ample power of diesel engines, making it a top brand for the pick-up truck genre. However, in recent times, Cummins has been experiencing some problems with its first-generation engine, but with great responsibility, it has managed to achieve a resolution of these problems with its new 2nd-generation improved engine with a much-improved transmission. This blog is all about the 2nd gen Cummins updated transmission, its towing capacity, and its other related features.

About the actual pickup truck

Its body shape was one of the primary characteristics that distinguished the next generation of Dodge diesel trucks. Cummins’ 5.9-liter second-generation engine was also updated with some modifications. It is similar to the engine used in the first-generation Dodge pickups and was used from 1994 to 1998. Dodge Ram 2nd-gen Cummins-powered trucks were available in club and crew cab configurations, primarily in the 2500 and 3500 heavy-duty models.

About the Cummins

There are two generations of Cummins diesel trucks produced by Dodge between 1994 and 2002 known as the second generation Cummins diesel truck. Cummins’ second generation engine comes in two form factors, which are as follows:-

  • The engines of the 1994–1998 trucks have 12 valves and are quite similar to those of the earlier trucks.
  • A 5.9L Cummins engine with 24 valves is featured in trucks built between 1998 and 2002.

Although it was originally intended for medium-duty commercial vehicles, it was first installed in on-highway pickup trucks in 1989.

About the 2nd Generation Cummins

Being the original generation Cummins was so popular and reliable; these vehicles had a lot of ground to make up. Thankfully, these vehicles are still quite dependable while getting a little more advanced. A second-generation Cummins is defined as a Dodge Ram pickup engine with either a 5.9L 12-valve Cummins or a 5.9L 24-valve Cummins engine that was manufactured between 1994 and 2002.

This analysis begins at the beginning, even though the 5.9-liter Cummins engine was built in many variations. Known as the 12-valve engine, this was the first version of the engine. This iteration is well known for its durability, with many engines lasting hundreds of thousands of miles with proper maintenance.

2nd Generation Cummings transmission

As for the power plant used in 2nd-Gen trucks, things get a little complicated since two models of the famous 5.9-liter Cummins oil burner was available:-

  • One with 24-valve High-Output
  • Another with superpowers.

There were still 12-valve engines with mechanical fuel in use between 1994 and 1998. A new VP44 Bosch injection pump coupled with Cummins power plants with 24-valve engines was launched in the middle of 1998. The features are as follows:-

The new P-Pump Engines

It is the P-pump engines that are installed on these pickup trucks that make them one of the most desirable among the two since they can easily be adjusted to flow a larger volume of fuel, which enhances the performance of the diesel engine.

It has been proven that P-pump 12V engines can be improved by adding high-pressure fuel injectors, an intercooler with a wastegate, redesigned pistons, as well as a Holset H1C turbocharger. With a five-speed manual transmission, the diesel engine is able to deliver about 175 horsepower and 420 lb-ft of torque, while reducing its emissions.

Engine Power

Although the performance of this vehicle was far superior to that of other vehicles in its class, the figures were well above the 6.7-liter Cummins’ standard 400 horsepower and 1,000 pounds-feet.

On 5.9-liter 12-valve engines between the late 1994 model year and the last model year of 1998, Holset HX35 turbochargers were used, which produced higher boost pressure. Towards the end of 1998, Dodge updated the Cummins engine installed in its 2500 and 3500 trucks with a 5.9-liter displacement.

The then-new diesel’s head included four valves per cylinder and a Bosch VP44 rotary-electric injection pump, which manages fuelling operations by utilizing input from the ECM. There was an interesting thing that was done to this engine that involved keeping the mechanical injectors but adding an electronic lift pump to aid in the refuelling process.

Towing capacity

There have been many improvements made to maximum towing capacity between 1994 and 2002, so you will be amazed by the new Cummins 2nd generation towing power. Along with the increased tow capacity, the new Cummins also brings improved fuel economy and increased reliability – making it the perfect engine for heavy-duty towing. Alternatively, if you want to get your truck’s exact towing capacity and payload information, check your owner’s manual.

Additional Information: The years 2001 and 2002 saw the availability of a High Output Cummins engine for trucks, and a slightly higher compression ratio was added to the HO powertrain. But little else was added to create the large numbers, apart from a stronger NV5600 version with a six-speed manual gearbox. They were capable of producing up to 245 horsepower and 505 lb-ft of torque.  

Other Performance Features

Here are a few other performance-related features you could avail in the 2nd Generation Cummins:-

Injecting fuel technology

With new injectors, an injection pump, and revised pistons, early Second Generation Cummins were equipped with a new fuel injection system to improve combustion events and reduce emissions. As far as this fuel system is concerned, the most important part by far is without a doubt the Bosch P7100 mechanical injection pump which plays a crucial role. A P-Pump injection pump provides better fuelling than any other pump available on the market and can be upgraded for even greater performance and flow if desired.

Involvement of P-Pump

The P-Pump on its own is not sufficient for this purpose, and the addition of injectors designed to handle higher fuel pressures is needed in order to complete the process. They are designed to withstand the greater fuel pressures created by the P-Pump, which is necessary to ensure the fuel is delivered efficiently and reliably. The injectors are what complete the task by delivering the fuel to the combustion chamber. A modified piston fuel-bowl design was used to improve combustion quality and swirl.

Air induction features

A new turbo charger is installed with a larger intercooler, and a new second-generation Cummins engine that was introduced recently. As part of the first-generation Cummins, a waste gate version of the turbocharger was included as the first turbocharger offered in the 1994 Dodge Cummins. There have been several tests conducted on this turbocharger that has shown that it can achieve 40 psi, in addition to factory settings of boost

With the inclusion of the new turbocharger, the second-generation Cummins engine is the most advanced Cummins engine to date, offering more power and efficiency than its predecessor.

The engine of choice

The vehicle that is recommended for racing and high-performance purposes is a late 12V Dodge Cummins truck that is powered by the Cummins engine. The motors are more than capable of handling an increase in horsepower in excess of 1,000 with a few minor improvements. The motors are more than capable of handling more power with a few minor changes.

Even as a daily driver, the 12V Cummins can be a great choice, since these diesel engines may last for hundreds of thousands of kilometers without requiring major maintenance, even with the addition of a tune and a few other performance enhancements to their engines.

New turbocharger

Additionally, the Cummins engine of the 2nd Generation has been modified with a new turbocharger and a larger intercooler. With the Holset HX35, pressures could be sustained up to 40 psi while stock boost levels could be maintained better. This turbocharger setup will allow the 2nd Gen Cummins engine to produce more power and torque, making it a top choice for those looking for reliable and efficient performance.

In late 1994–1998 Cummins have a different turbocharger called the Holset H1C turbocharger, and the 2nd generation cummin is equipped with an improved Holset HX35W or HX35 turbocharger. There is still the popularity of the 12-valve Dodge Cummins, particularly for racing purposes, and this new turbocharger is renowned for its dependability no matter how far it is driven. 

Mileage of Cummins

5.9 Cummins Engine

For about 300,000 miles, the best-kept 5.9-liter engines don’t require significant repair, while some can survive considerably longer with careful maintenance. It is Cummins’ reputation for outstanding durability that has resulted from keeping all 5.9-liter engines up to date. In fact, Cummins has established a high mileage club specifically for customers who own vehicles with more than 100,000 miles on them.

6.7 Cummins diesel engine

In order to comply with pollution regulations while still providing a similar level of power, Cummins increased the displacement of the 6BT engine to 6.7 liters in order to meet pollution regulations. 6.7 Cummins engines have electronic controls that reduce fuel consumption while achieving higher power at lower RPMs. Well-maintained 6.7 engines may last 300,000 miles before needing major repairs, while the 5.9 may require less frequent maintenance.


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