The BD Diesel 1064444SM TowMaster 4R100 Transmission & Converter Package is the ultimate drivetrain upgrade for 1999–2003 Ford Super Duty 4WD trucks with the legendary 7.3L Power Stroke engine. This heavy-duty transmission and torque converter combo is engineered to outlast and outperform stock components, delivering stronger shifts, increased cooling, and improved towing capability.

Packed with internal upgrades, BD's 4R100 transmission includes a recalibrated accumulator body, added lubrication circuits, increased clutch counts, and a fully rollerized geartrain. The BD ProForce torque converter improves low-RPM response and efficiency while reducing heat and enhancing fuel economy—making it perfect for street, towing, and work truck applications.

💰 Requires $1,500 Refundable Core Charge
⏱️ Estimated Install Time: 7 Hours
⚠️ Excursion models must reuse OEM-style pan due to crossmember clearance

Transmission Upgrades:

• +6qt BD Deep Sump Aluminum Pan for added fluid & cooling

• Recalibrated accumulator body for firmer, quicker shifts

• Full shift kit with line mod valve increases converter pressure

• Added lubrication to OD planet, output shaft, and intermediate shaft

• Machined center support & reworked front pump

• Drilled/tapped feeds prevent internal leakage at the case

• Upgraded Clutch Counts:

  • Forward: 5 (↑ 25%)

  • Overdrive: 4 (↑ 33%)

  • Intermediate: 4 (↑ 33%)

  • Low Reverse: 7 (↑ 17%)

  • Coast Clutch: 2

  • Direct Clutch: 5

• Fully rollerized geartrain for reduced friction

• Upgraded OD snap ring

• Dyno-tested for quality assurance

• Auxiliary full-flow frame-mounted filter kit (1990–2003)

ProForce Torque Converter:

• Torque-multiplying cast aluminum stator

• Lower RPM response vs. stock

• Furnace-brazed turbine fins

• Stamp-forged steel front cover

• Improved fuel efficiency & reduced heat generation

🚙 Vehicle Compatibility:

• 1999–2003 Ford F-250 Super Duty 7.3L Power Stroke 4WD (4R100 Transmission)

• 1999–2003 Ford F-350 Super Duty 7.3L Power Stroke 4WD (4R100 Transmission)

• 2000–2003 Ford Excursion 7.3L Power Stroke 4WD (See pan note below)

❌ Will not fit applications requiring PTO
⚠️ Excursion models must use OEM-style transmission pan
⚠️ Remote filter required for inspection w/ cooler flow GPM at cooler outlet

📦 What’s Included:

• BD TowMaster 4R100 Transmission (Assembled & Dyno-Tested)

• ProForce Torque Converter

• BD Heavy-Duty Deep Sump Pan (Excursion uses OEM pan)

• Shift Kit with Line Mod Valve

• Auxiliary Frame-Mounted Filter Kit

• Upgraded Clutch Packs, Valve Body, Lubrication Circuitry

• 36-Month / 150,000-Mile Parts Warranty

• 12-Month / 24,000-Mile Labor Warranty

🛠️ Why Choose BD Diesel?

The TowMaster Series from BD Diesel is trusted by diesel enthusiasts and work truck owners for one reason: it gets the job done. This 4R100 build is packed with long-term durability upgrades, cooler-running hardware, and crisp-shifting engineering—all backed by industry-leading warranties and real-world performance testing.

Whether you're hauling a trailer, moving gear, or just want your 7.3L to drive like new again, BD builds it better.