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TREMEC TR-4050 5-Speed and A41X 4-Speed Automatic for 4WD

TR-4050 4WD 4X4 Ford Cummins GM Chevrolet GMC Jeep Mopar RAM

Choose an Application

Cummins Ford GM Jeep Land Rover Mopar

Cummins Diesel

  • 4BT
  • 6BT
  • R2.8
  • 5.0


  • 289, 302, 351
  • I6 - 240, 300
  • Modular V8

General Motors

  • SBC
  • BBC
  • LS
  • LT
  • 3rd Gen I6

AMC / Jeep

  • I6 - 232, 242, 258
  • V8 - 304, 360, 410

Land Rover

  • Defender

Dodge / Mopar / RAM

  • V8 - 318, 340, 360
  • Gen III Hemi

 More to come!

Replaces the AX15, NV3500, NV3550, and NV4500 5-Speeds and the NP435A, NP435L, NP435D, NP435E, T18, T19, and SM465 4-Speeds. 

 Silver Sport Transmission Partner Companies

To help us engineer and source components for our TREMEC TR-4050 5-Speed and A41X 4-Speed Automatic, we partnered with several companies. These companies share our devotion to quality components and superior designs. You'll find their bellhousings, adapter plates, and other components in our kits.

Choose a Partner Company to Learn More

Advance Adapters


Click on a Project Vehicle to Learn More

Jay Leno's Bronco SEMA 2019


1968 Ford Bronco - Craig Ferguson left Jay Leno a 1968 Ford Bronco in his parking spot as a practical joke Leno's last "Tonight Show" taping. The joke's on Ferguson though, Leno loved it. After sitting in his garage for several years, Ford Performance and SEMA Garage got a team together to build something special... the engine out of a brand new Mustang Shelby GT500 and a TREMEC TR-4050 from Silver Sport Transmissions special! Click on Jay's Bronco to see more photos and learn more about the build.


Ford Bronco

1st Gen Ford Bronco - Brand New Muscle Car (BNMC) built this early Bronco out of a combination of brand new parts and a classic Bronco. It features our TREMEC TR-4050 5-Speed. Watch the entire season by clicking the Bronco above.

1964 International Scout 

1964 International Scout 80 - Trenton McGee built this 1964 International Scout 80 4x4 to take on the 2019 Ultimate Adventure. He needed a transmission that could handle the trails and called us to get a TREMEC TR-4050 5-Speed. He documented every step for FourWheeler Magazine. Click the thumbnail to see photos of the trek and links to the articles. 



1991 Dodge W250

1991 Dodge W250 - Don Scott acquired this historically significant truck, but it needed a new transmission to get it around the country to promote the Cummins BioDiesel engine. He also likes to take it on the trail. Click the thumbnail to see more photos and read more about the history of this particular pickup truck.



2002 Jeep Wrangler - This Jeep was purchased solely to develop a kit for the TJ Jeeps by SST. Our first 4WD project, this Jeep goes with us to shows and to the trails on weekends to promote the TREMEC TR-4050. Several of our customers first learned about the TR-4050 by driving this Jeep. We documented the entire process, click the thumbnail to see installation videos and photos of the Jeep in action.