Ford Cummins Conversion and Why It’s So Popular

A Ford Cummin Swap—Enjoy a Better Ride

Although many drivers appreciated the luxurious interiors of Ford trucks, their engines often were not as highly regarded, which over the years made the Ford Cummins Conversion a popular solution.

Over time, the problems with the 6.0 Ford Powerstroke engine became well known. Many experts felt that most of these issues stemmed from the original design.

Common concerns include:

  • The factory EGR system for emissions standard compliance
  • The 6.0 head studs, which did not have enough clamping force and caused blown head gaskets
  • HPOP failure
  • Injector stiction
  • Oil coolers clogging
  • FICM failure

Even though everyone considered the 6.0 the “problem child,” the 6.4 did not provide enough improvement. In the 6.4, the EGR system still needed improvement, the fuel system had corrosion issues, turbo pipes cracked, plus there were oiling issues.

For these main reasons, many people elect to swap a Cummins into their Ford truck. A Ford Cummins Swap is an excellent option for those who want the loaded interiors of Ford trucks with Cummins engines’ reliability. The Cummins engines are powerful yet simple. Plus, they are very reliable and reasonably priced. For these reasons, a Ford Cummins conversion, or Fummins swap is an ideal diesel conversion for Ford trucks.

Why the Cummins?

Dodge began to outsource the manufacturing of their heavy-duty truck motors to the world-renown company, Cummins, in 1989, and the 6BT was the result. Dodge first used the 5.9L Cummins motor in their RAM trucks staring in 1989. They built the truck around the engine that met the expectations of even the most demanding consumer.

Initially sold with a mechanical Bosch VE injection pump, the diesel was reliable but underpowered compared to today’s standards. With 160hp and 400 ft-pounds of torque, the motor was well-suited for the first RAM.

Thanks in part to the mechanical Bosch VE injection pump and mechanical timing, swapping this first-generation motor is reasonably straightforward, requiring only one electrical hookup and fuel hookup. Although sluggish in stock form, when modified correctly, the 5.9L Cummins produces over 600 horsepower.

The Cummins engine was known for simplicity. The 12V version took only a few wires to run since most components on it were mechanical. Eliminate the electronics and other problem-causing factors, and you have a reliable, simple engine ready to swap into anything that can hold its weight.

Ford Cummins Aftermarket

Because of its popularity, Cummins Conversion components are a thriving aftermarket. The following parts make a Fummins Swap possible:

  • Transmission adapter kits
  • Swap kits
  • Exhaust systems
  • Fuel components
  • Cooling system components
  • Motor mounts
  • Wiring
  •  Sensors

Ford Cummins swap compatibility

The 12 valve Cummins is the simplest of the group. Introduced in 1998, the 24V Cummins is more powerful but has more electronics. Next, in 2003, they came out with the Commonrail Cummins which had a high-pressure fuel rail. All of these engines are prime candidates for a Ford Cummins swap. However, you must use a Ford Cummins conversion kit to make the swap possible.

It was the most popular in the 6.0 Ford truck. However, the Fummins swap was also done in 7.3 and 6.4 trucks. Cummins Swap Kits are available to adapt a Ford 5r110 automatic transmission, Allison 1000, and early Chevy transmissions.

Adapter Kits make things easier

Without an adapter kit to mount a Cummins to a Ford or Chevy transmission, it would be challenging to do a Cummins Conversion. Motor mounts and other swap components make the swap straightforward. There are a few companies offering full Cummins Swap kits. These kits might seem expensive at first, but they save time and frustration in the long run.

More Fummins Swap Information

The G Force Cummins Swap Kits for transmissions have three different options:

  • 5r110
  • Allison 1000
  • Early Chevy transmissions.


GF-F5R110-S 1989-2002 Cummins to Ford 5R110 bellhousing adapter and flexplateThe 5r110 is a 5-speed automatic introduced in 2003. It held quite a bit of power and was a reliable transmission. The gear ratios are as follows:

Gear Ratios:

1st: 3.09
2nd: 2.20
3rd: 1.54
4th: 1.09
5th: 1.00
6th: .71 (overdrive)

This transmission was electronically controlled and had a lot of features such as “cold mode” and “limp mode.”

Allison 1000

GF-A-S 1989-2002 Cummins to Allison adapter kit with flexplate, bellhousing adapter plate and mounting boltsThe Allison 1000 transmission was introduced in 1999 and offered in 2001 to present production trucks. The Allison 1000 transmission was behind primarily the Duramax engine. It is a very strong transmission and perfect for a Cummins Conversion.

The older Chevy transmissions are not the strongest, but they are an option behind a moderate power Cummins. For example, the 4l80e can be used as part of a Cummins swap.

If you’re looking to complete a Cummin Conversion, our dedicated team of experts is available to answer your questions. You may reach out to us on Chat or call 330-753-5300.

Your Cart