7.3 Powerstroke to Cummins Swap: 1999-2002 Ford
The 1999-2002 Ford Super Duty came with the 7.3 Powerstroke. It's a good engine, and when it needs a rebuild or you want more power, a 5.9 or 6.7 Cummins is the common next step. You keep the truck, the frame and the transmission.
Driving a 1994-1997 OBS with the 7.3? That's the ZF5 or E4OD, covered in the 1980-1997 OBS guide.
7.3 ZF6 (S6-650) to Cummins kits
For 1999-2002 trucks with the ZF6 6-speed. Each package comes with the adapter plate, a machined flywheel with the Ford pilot bearing installed, a starter spacer if your build needs one, all the hardware and install instructions. Clutches are Kentucky Clutch.
| Package | Common rail Cummins | 12/24V Cummins |
|---|---|---|
| Adapter + flywheel | $1,150 | $1,150 |
| + Stage 1 clutch (350hp) | $1,650 | $1,650 |
| + Stage 2 clutch (450hp) | $1,750 | $1,750 |
| + Stage 3 clutch (650hp) | $2,395 | $2,395 |
Common rail packages fit 2003-2022 5.9 and 6.7 Cummins. 12/24V packages fit the 1989-2002 5.9.
7.3 4R100 automatic to Cummins
The 12/24V Cummins to 7.3 4R100 adapter ($1,249) bolts a 1989-2002 Cummins to the 1999-2003 4R100 and comes with a billet steel flexplate and the hardware. It takes a 6.0 or 6.4 Powerstroke starter. We recommend the 6.4, since the 6.0 starter can need bell housing clearance on some transmissions.
Motor mounts for the 1999-2002 frame
| Your Cummins | Mounts | Price |
|---|---|---|
| 12/24V 5.9 (1989-2002) | 99-07 Ford Super Duty Motor Mounts to 89-02 Cummins (12/24v) | $425-$460 |
| Common rail (2003-2022) | 1999-07 Ford Superduty Motor Mounts to 2003-2022 CR Cummins | $475-$510 |
The mounts move the engine and transmission back 2.5 inches so you can run a mechanical fan. They're CNC laser cut, robot welded and use 6.4 rubber isolators. Powder coat is optional and adds up to a week.
The rest of the 7.3 parts list
- 6.0/6.4 starter spacer ($25) if your starter setup calls for it
- AC and alternator mounting for the Cummins
- Wiring, fuel supply, intercooler piping and exhaust, which we don't sell
The full swap parts list shows every part by truck.
7.3 to Cummins questions
Can I put a 5.9 in my 7.3?
Yes. The 12/24V packages fit the 1989-2002 5.9, and the common rail packages fit the 2003-2022 5.9 and 6.7.
Do the ZF6 packages come with a clutch?
The adapter and flywheel package doesn't. Stage 1, 2 and 3 packages include a Kentucky Clutch.
12 valve, 24 valve or common rail?
The 12 valve is the simplest to wire. The common rail makes the most power from the factory but is fully electronic. Compare all three.
How fast does it ship?
Most orders ship in 1-3 business days from Blaine, MN.
Not sure what fits your truck? Use the Parts Finder. Pick your year, engine and transmission and it shows what fits.
See every 7.3 swap kit · All 1999-2002 parts
More swap guides
- 1980-1997 Ford OBS Cummins Swap Guide
- 7.3 Powerstroke to Cummins (1999-2002 Ford)
- 6.0 Powerstroke to Cummins (2003-2007 Ford)
- 6.4 Powerstroke to Cummins (2008-2010 Ford)
- Ford V10 to Cummins Swap Guide
- Ford Cummins Swap Parts List: every part, by truck
- Compare Conversion Kits: 12V vs 24V vs common rail
- Swap FAQs: the questions we get every week