1999-2002 Ford 7.3 Cummins Swap
The 1999 to 2002 Ford Super Duty came factory with the 7.3L Power Stroke, a workhorse engine that earned a strong reputation. But when 7.3 owners want a serious upgrade, the Cummins swap is one of the most common paths.
Why Swap?
- You want more horsepower than the 7.3 can comfortably make.
- The 7.3 needs a top-end rebuild and a Cummins is cheaper than the parts.
- You want a Bosch P7100 mechanical pump for race or sled-pull duty.
- The truck is your daily driver and you want it to outlast the rest of the body.
Engine Choices
For 1999 to 2002 Super Duty swaps, either a 12V or 24V 5.9L Cummins works well. The CR Cummins also fits but adds wiring complexity. Pick the engine based on the power level you want and how much electronic control you want in the truck.
Transmission Options
- ZF6 manual (S6-650) — the factory 6-speed in many 7.3 trucks. Strong, well-supported.
- 4R100 automatic — factory 4-speed auto. Works with a built converter on stock-power Cummins builds.
- NV4500 or NV5600 swap — popular among purists.
What You'll Need
- An adapter plate (12V/24V or CR to ZF6 or 4R100).
- Billet flywheel or flexplate.
- Motor mounts for the 99-07 Super Duty frame.
- AC/alternator bracket.
- Throttle pedal adapter for the electronic pedal (CR Cummins).
- Fuel and wiring.
Shop 1999-2002 Parts
→ Shop 1999-2002 Ford Cummins Parts
Talk to Us First
Every 7.3 swap is a little different depending on your trim level, transmission, and target engine. Call (612) 801-4388 and we will spec out the kit for your specific truck.
Related Swap Guides
- 1980-1997 Ford OBS Cummins Swap Guide
- 2003-2007 Ford 6.0 Cummins Swap Guide
- 2008-2010 Ford 6.4 Cummins Swap Guide
- Compare Conversion Kits — 12V vs 24V vs CR Cummins side-by-side
- Cummins Swap Glossary — plain-English term definitions
- FAQs — the questions we get every week
