BUILT TO ELIMINATE CLUTCH SLIP, CONVERTER BALLOONING, AND CRACKED FLEXPLATES

FORD 7.3L POWERSTROKE 99-03 TRANSMISSION

Upgrade the 4R100 automatic or ZF6 manual transmission in your 1999-2003 Ford 7.3L Powerstroke with complete performance transmissions, heavy-duty torque converters, rebuild kits, and hard parts built for towing and added horsepower.

  • Complete Performance Transmissions

    Choose from TowMaster and ROADMASTER series 4R100 transmissions, remanufactured with upgraded clutches and valve bodies for towing and performance.

  • Heavy-Duty Torque Converters

    Our Proforce converters feature furnace-brazed fins and reinforced components to handle increased torque without slipping or failing.

  • DIY Build-It Kits

    Build your own with the same upgraded clutches, steels, and components used in our in-house builds.

  • Upgraded Hard Parts

    Strengthen weak points with billet input shafts, heavy-duty flexplates, and performance accumulator bodies.

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FIND THE RIGHT FORD 7.3L POWERSTROKE 99-03 TRANSMISSIONS FOR YOUR TRUCK

Find transmission solutions for the legendary 7.3L Powerstroke, primarily focused on the 1999-2003 Super Duty and Excursion platform. See our table for common applications.

ApplicationEngineCommon YearsTypical ProductBest For
Ford F-250 / F-350 Super Duty (4WD)7.3L Powerstroke1999-2003TowMaster Ford 4R100 TransmissionA complete, drop-in replacement for daily driving, towing, and light performance use.
Ford F-Series / Excursion7.3L Powerstroke1999-2003Build-It Trans Kit Stage 4 Master RebuildProfessional builders and shops creating a high-strength 4R100 for racing or heavy-duty applications.
Ford F-Series (E4OD / 4R100)7.3L Powerstroke1995-2003Proforce 6 Stud Torque ConverterUpgrading the torque converter to improve lock-up and handle increased engine power.
Ford F-Series Super Duty (ZF6)7.3L Powerstroke1999-2003Clutch Kit - 475hp/1000tqOwners of manual transmission trucks needing a clutch that can hold significant power increases.

WHY FORD 7.3L POWERSTROKE 99-03 TRANSMISSIONS FAIL AND HOW BD SOLVES IT

From the factory, the 4R100 transmission behind the 7.3L Powerstroke was adequate for stock power levels. However, when you add a tuner, a larger turbo, or regularly tow heavy loads, its weaknesses become apparent. Common failure points include slipping clutches, torque converter ballooning, valve body wear causing poor shifting, and cracked flexplates.

  • Overheating Transmission

    The stock cooler can be overwhelmed by heavy towing, causing fluid to break down and leading to clutch failure.

    The BD Difference

    Upgrading to a BD Xtrude transmission cooler is a critical first step to protect fluid and clutches.

  • Slipping or Shuddering

    This often points to a failing torque converter or worn clutches.

    The BD Difference

    A BD Proforce torque converter and performance clutch kit provide superior holding power.

  • Soft or Delayed Shifts

    Wear in the valve body or accumulator body can reduce line pressure, resulting in lazy shifts.

    The BD Difference

    Our accumulator bodies and shift kits restore crisp, positive shifting.

  • Cracked Flexplate

    A known failure point, especially on higher-mileage or modified trucks.

    The BD Difference

    A BD Billet Flexplate is a must-have upgrade for reliability and to prevent catastrophic failure.

What is the difference between a TowMaster and ROADMASTER transmission?

Our TowMaster series is ideal for stock to moderately powered trucks used for towing and daily driving. The ROADMASTER series features additional hard part upgrades built for trucks with more significant power modifications.

Do I need a billet input shaft for my 4R100?

A billet input shaft is highly recommended for any 7.3L Powerstroke making significantly more power than stock, especially if you tow heavy or engage in competitive events, since it prevents the shaft from twisting or breaking.

What do you offer for the manual ZF6 transmission?

We offer upgraded single-disc clutch kits for the 1999-2003 7.3L with the ZF6 manual transmission, designed to handle up to 475 horsepower and 1000 lb-ft of torque.

What comes in a Build-It kit?

Our Build-It kits are comprehensive overhaul packages that typically include all the upgraded clutches, steels, seals, gaskets, and modified components needed to assemble a performance transmission.

Are your transmissions new or remanufactured?

Our transmissions are fully remanufactured. Each unit is completely disassembled, cleaned, inspected, and reassembled using new OEM parts and our own upgraded performance components that exceed factory specifications.

Why should I upgrade my torque converter?

The stock torque converter is a major weak point. Our Proforce converters are furnace-brazed and feature a stronger billet stator and cover to prevent clutch slippage and handle high torque output.