Ford 4R100 Transmission for Sale

About This Transmission

The Ford 4R100 is the heavy duty 4 speed automatic transmission that powered the Ford Super Duty truck line, Excursion SUV, and E-Series vans from 1998 through 2004. Introduced in 1998 as the direct successor to the E4OD, the 4R100 was specifically designed to handle the massive torque output of the 7.3L Power Stroke diesel as well as the 6.8L Triton V10, the 5.4L Triton V8, and the 6.0L Power Stroke (early 6.0 applications).

The 4R100 carries a stock torque rating of approximately 535 lb-ft when paired with the 7.3L Power Stroke and was the workhorse transmission of one of the most respected diesel pickup combinations ever built. Where the E4OD struggled with the 7.3L torque output and developed a reputation for failure, the 4R100 brought a billet input shaft, a heavy duty torque converter, an electronic Tow/Haul mode, and revised valve body calibration that dramatically improved durability under load.

The 4R100 was replaced by the 5R110W TorqShift starting in 2003 for the 6.0L Power Stroke and fully phased out by 2005, but it remains the transmission of choice for 7.3L Power Stroke owners who prefer a 4 speed simplicity and the fully mechanical 7.3 to 4R100 combination.

Signs You Need a Replacement Transmission

• Slipping in 1st or 2nd gear, often a sign of clutch pack wear
• Hard 3 to 4 shift or no overdrive engagement, common at high mileage
• Torque converter shudder under lockup load
• Burnt fluid (dark, smells acrid)
• Limp mode, transmission stuck in 2nd or 3rd gear
• Cracked case, common on units that have been overpowered or improperly mounted
• Overheating on towing duty, indicating worn pump or contaminated fluid

Known Things to Know Before You Buy

• Diesel vs gas input shaft: The 7.3L Power Stroke and 6.0L Power Stroke 4R100 has a 31 spline input shaft. The gas 6.8L V10 and 5.4L 4R100 has a 26 spline input shaft. They are not interchangeable without changing the input shaft. We confirm spline count before every order.
• Tow/Haul mode wiring: Tow/Haul is electronically controlled by the PCM. The 4R100 itself supports Tow/Haul; the dash button and wiring must be present on the donor truck.
• Early 6.0L 4R100 vs 5R110W: The early 2003 6.0L Power Stroke trucks used a 4R100. The 5R110W TorqShift took over later in 2003 and continued through 2007. If you have an early 6.0, a 4R100 is correct. Late 2003 onward 6.0 trucks need a 5R110W.
• 4WD adapter: 4WD 4R100s use a transfer case adapter to mate to the BorgWarner 4406 or 4407 transfer case. We confirm 2WD vs 4WD configuration on every order.
• Banjo bolt seals and cooler line fittings: Always replace these at install.

4R100 Variants by Engine Pairing

Verified configurations:

What Is Included, What Is Not Included

Vehicle Compatibility, Direct Fit

Direct factory applications:

Engine compatibility: 7.3L Power Stroke V8 Diesel (1998 to 2003), 6.0L Power Stroke V8 Diesel (early 2003 only), 6.8L Triton V10, 5.4L Triton V8, 6.2L Boss V8 (retrofit applications).

Not sure if this fits? Call (240) 301-0095 with your year, model, engine, and 2WD or 4WD. We confirm spline count and configuration before every order ships.

Used OEM vs Rebuilt vs Built 4R100

A used OEM 4R100 from a 7.3L Power Stroke or 6.8L V10 donor with verified pressure test and shift test results is the most cost effective option for most replacement projects. Our 4R100s are pressure tested, shift tested, and the engine pairing and spline count are documented.

A professionally rebuilt 4R100 typically runs $2,800 to $6,500 depending on engine pairing and rebuild specification. Standard rebuild includes new clutches, bands, seals, and a re manufactured torque converter. Rebuilt 7.3L versions cost more due to the higher specification components.

A built 4R100 (BD Diesel, Suncoast, ATS Stage 5) is rated for 700 to 1,200 hp and runs $5,500 to $9,000. This is the right path for tuned 7.3 or 6.0 Power Stroke trucks running deletes, larger turbos, or sled pull duty.

Condition and Inspection Process

• Pressure test on the dyno bench, line pressure recorded across all gears
• Shift test on the dyno bench, all 4 forward gears, reverse, and overdrive engagement tested
• Torque converter inspected for lockup clutch condition
• Valve body and electronic solenoid pack tested
• Internal harness inspected for damage
• Case inspected for cracks, output shaft for runout, splines for wear
• Input shaft spline count confirmed (31 spline diesel or 26 spline gas)
• 4WD adapter or 2WD tail housing configuration documented
• Donor vehicle engine pairing confirmed

Mileage is documented when available from the donor vehicle. Where mileage cannot be confirmed (salvage), we disclose this before shipping.

Buyer Tips, What to Know Before You Order

• Spline count first: A 31 spline 7.3 Power Stroke transmission is not the same as a 26 spline V10 transmission. They are not cross compatible without an input shaft swap.
• Tow/Haul mode requires correct PCM and dash wiring. Confirm before installation.
• Plan a complete fluid flush at install regardless of unit condition. Mercon V only.
• Cooler line and pan gasket should be replaced at install.
• 7.3L Power Stroke trucks running tunes or modifications above stock should consider a built 4R100 to handle increased torque. A stock used unit will live behind a stock truck. A tuned truck will eventually fail a stock unit.

Why Buy From Vaz Auto Solutions

• Year, engine pairing, and spline count documented before you pay
• 2WD vs 4WD configuration confirmed before shipping
• Pressure tested and shift tested on the dyno bench
• Torque converter inspected for lockup clutch condition
• Donor vehicle and engine pairing disclosed where available
• Fitment verified for your specific Super Duty, Excursion, or E-Series application
• No core charge, keep your old transmission
• Free freight pallet delivery to all 50 states, no hidden fees
• 15 day replacement warranty on internal defects
• Call (240) 301-0095, talk to someone who actually understands the 7.3 Power Stroke 4R100 spline count and configuration differences