Tremec TR4050 TRANSMISSION and adapter kit fits Cummins B series

Tremec TR4050 TRANSMISSION and adapter kit fits Cummins B series


Bell housing adapter kit combining the Cummins 4BT and Tremec TR-4050.


Cummins 4bt 6bt to the HD Tremec TR-4050:

This 4bt adapter kit bolts the Cummins B series to the HD Tremec TR4050.  In addition to this kit, we have been selling other Cummins 4bt adapter kit for years now and as a result we recognize that packaging the parts makes the whole process easier. This is not a complete installation kit but includes the everything needed to bolt the TR4050 to the Cummins 4bt or 6bt.

The Tremec TR-4050 is a major upgrade in the 4×4 and off road market.  It was showcased along with our adapter solution in the Ultimate Adventure 2019 Petersen’s Scout driven by Trent McGee and Christian Hazel.

Some benefits include:

  • A torque rating of 425 LB-FT (based on a 15,000 GVWR),
  • 6.16 first gear, all gears synchronized,
  • 24.5″ long with 2.8 adapter kit bell.
  • Also directly bolts to a number of Chrysler Dodge Jeep manual transfer case boxes.  Perfect for your Cummins swap.

What is included with the Tremec TR4050 Cummins 4bt:

  • Tremec TR-4050 with shifter stub.
  • Bell housing kit fitting the Cummins 4bt and 6bt
  • Off the shelf clutch kit that can be replaced at any auto parts store.
  • External slave cylinder.
  • HD clutch fork, pivot ball, and throw out bearing.
  • Modified Cummins flywheel with pilot bearing installed.


Usually shipping will take 7 to 12 business days depending on location and will go to the nearest Terminal to the customer of QDB’s choice.  Therefore customers simply show up at the terminal and pick it up between 7am to 5pm.  We have very competitive shipping rates because of our monthly volume of engines going to customers.  For an additional cost shipping to a customers business or residence is possible.

California, Alaska, and Hawaii will have to pay additional freight regardless of delivery location because of distance.

Silver Sport Transmission; provides this TR4050  warranty information.  Tremec is the contact for all warranty issues.

Additional Info:

We are a retailer for the Cummins 4bt 6bt and 2.8 as well as the Tremec TR4050 but is not a representative of either company therefore QDB does not have any affiliation with the manufacturing of those companies parts.

We are available by phone, text, and email to answer any questions regarding this kit and other Cummins swap conversations.   As always we offer both Military as well as check, cash, or wire discounts.  If you are looking for the complete engine Transmission kit CLICK HERE.

Promotional Bullet proof testing:

In conclusion, here is a promotional video showing the toughness of our bell housings.  Some photos showing engine and transmission combination are for representation.


Additional information

Weight350 lbs
Dimensions48 × 40 × 28 in


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