Built to go beyond stock limitations, the BD Diesel TowMaster 4R100 Transmission is your solution for upgraded drivetrain durability on 1999–2003 Ford Super Duty trucks with the 7.3L Power Stroke (4WD). Engineered with performance and longevity in mind, this unit includes key upgrades to clutch packs, lubrication, hydraulics, and shift control to improve reliability under load.

From firmer shifts to additional lube circuits, a fully rollerized geartrain, and increased clutch counts, this BD transmission is dyno-tested and designed to handle real-world towing, work, and power demands. A full-flow auxiliary filter kit is included for added protection.

💰 $1,200 USD refundable core deposit required.

✅ Key Features:

Transmission Highlights:

• BD Aluminum Deep Pan adds 6 quarts of oil capacity

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

• Recalibrated accumulator body delivers firmer, quicker shifts

• Full shift kit with line mod valve for increased pressure

• Added lube to overdrive planet, output shaft, and intermediate shaft

• Drilled and tapped feed passages to prevent case leaks

• Upgraded OD snap ring and machined center support

• Reworked front pump and fully rollerized geartrain

• Dyno-tested for quality assurance

Clutch Count Upgrades:

• Coast Clutch: 2

• Forward: 5 (+25%)

• Direct: 5

• Low Reverse: 7 (+17%)

• Intermediate: 4 (+33%)

• Overdrive: 4 (+33%)

• Converter sold separately (see Part: 1030223 )

(BD Diesel Transmissions only have warranty when running a BD Trans & Converter)

🚙 Vehicle Compatibility:

• 1999 Ford F-250 / F-350 / F-450 / F-550 7.3L Power Stroke (4WD)

• 2000 Ford F-250 / F-350 / F-450 / F-550 7.3L Power Stroke (4WD)

• 2001 Ford F-250 / F-350 / F-450 / F-550 7.3L Power Stroke (4WD)

• 2002 Ford F-250 / F-350 / F-450 / F-550 7.3L Power Stroke (4WD)

• 2003 Ford F-250 / F-350 / F-450 / F-550 7.3L Power Stroke (4WD)

⚠️ Excursion models require use of factory-style transmission pan.
⚠️ 2WD models with driveline brake require 4WD transmission.
⚠️ Converter must be BD brand and installed at time of install to retain warranty.

📦 What’s Included:

• BD TowMaster 4R100 Transmission Assembly (No Converter)

• BD Aluminum Deep Transmission Pan (except Excursion)

• Auxiliary Frame-Mounted Full Flow Transmission Filter Kit

• Upgraded Clutch Packs (pre-installed)

• Machined Center Support

• Reworked Front Pump

• Aluminum Pressure Plug Kit

• Installation Guide

🛠️ Why BD Diesel?

BD Diesel has built its name on engineering transmissions that don’t just match stock—they outlast and outperform. The TowMaster 4R100 is purpose-built for trucks that work harder than factory designs can handle. From its heavy-duty internals to dyno-proven performance, BD delivers a transmission you can trust in demanding environments.