Street E40D Rebuild Kit w/ Torque Converter (800HP)

Next Gen Drivetrain, Inc.


     This is the “Street” series of our E40D transmission rebuild kit lineup. The E40D is a very old transmission platform based on the foundation of the Ford AOD dating back to the 1970’s. This means that the E40D is as old as it is outdated, and leaves much to be desired in terms of modern technologies that translate directly into longevity, performance or durability.

     Fortunately, we have gone back to the drawing board in the interest of creating a product where the priorities of longevity, durability and practical use were all equal. The result was our responsive and versatile Street E40D Transmission, now available in rebuild kit format.

Note: This is a rebuild kit, not a complete transmission. If you would like a complete transmission with our 2 Year / Unlimited Mile warranty, see our diverse and reliable Street E40D Transmission here:

>>> Street E40D w/ Torque Converter (800HP)

This unit is best for:

  • Daily Driving
  • Towing/Hot-Shotting
  • Stock to Moderate Power Increases
  • Long-Lasting Clutch Materials
  • Freeway Pulls/Boost Launching
  • Firm but Predictable Shifts
  • Commercial Use
  • Heavy Payload

About Next Gen Diesel Transmission Rebuild Kits:

     There are two main problems that most will come across when buying a rebuild kit for their transmission. The first problem, is the kit simply not having the parts needed to finish the job. Many rebuild kits come with gaskets and seals, a friction module and a shift kit. Although these are all justifiable purchases, they leave someone committed to “doing it right” with much to be desired. At Next Gen, this problem is simply nonexistent. We are proud to include every last component necessary to not only complete the job, but complete it properly and not have to purchase additional parts like electronics or bushings elsewhere.

     Secondly, it is just short of a standard for rebuild kits to possess different parts than what is used in the actual product. (i.e. lower quality clutches than what are used in the manufactured product) At Next Gen, we simply disagree. Our high performance rebuild kits are comprised of the exact same parts that we use in our own complete transmission builds, down to the clutch material. It may be a common practice for the rebuild kit to hail in comparison to the real deal, but at Next Gen, this is no more.

    Street E40D Rebuild Kit Specifications:

    • Billet Project Carbon Torque Converter
    • Billet Lockup Apply Piston
    • Raybestos High Performance Clutch and Steel Stack-Ups w/ Added Clutches
    • Billet Direct Pressure Plate
    • Billet Turbine Hub
    • Billet CNC Machined Stator
    • Billet Torque Converter Cover 
    • Billet Triple Disk Lockup Mechanism
    • Billet SFI Approved Flexplate
    • Billet 300M Input Shaft
    • E40D Project Carbon Center Support Kit
    • CNC Machined Pressure Regulator Boost Valve Upgrade
    • Recalibrated 1-2 Shift Valve Spring
    • CNC Machined Line Pressure Regulator Valve Upgrade
    • CNC Laser Cut "Formula One" Separator Plate
    • Recalibrating Shift Spring Set
    • Billet Overdrive Planetary Assembly
    • Custom Converter Clutch
    • Recalibrated Accumulator Spring Set
    • Borg Warner Updated 45 Element Sprag (w/ Complete Race)
    • Steel Laser-Cut Separator Plate w/ Custom Oil Circuitry
    • Updated OEM Center Support
    • Rigid Style Updated High Performance Band
    • Raybestos High Performance OD Clutch & Steel Kit w/ Added Clutches
    • Raybestos High Performance Intermediate & Steel Kit w/ Added Clutches
    • Raybestos High Performance Direct Friction & Steel Kit w/ Added Clutches
    • Raybestos High Performance Forward Friction & Steel Kit w/ Added Clutches
    • Raybestos High Performance L/R Friction & Steel Kit
    • OEM Solenoid Pack
    • Extra Deep Transmission Pan
    • Bronze Bushings
    • OEM Torrington Roller Bearing Kit
    • OEM Speed Sensors
    • OEM Paper/Rubber Gasket & Seal Kit
    • OEM Updated Anti-Cavitation Filter


         The E40D is nothing new, and neither are it’s problems. Fortunately, we have invested the time and understanding necessary to ensure that this transmission succeeds for the future. Through the modifications we perform to the hydraulics, friction elements, electronics and otherwise, we believe our Street E40D is ready for the challenge. If you have further questions, feel free to call and talk to one of our experts!