The Dana 20 offered in the 1966-77 (Early) Ford Bronco is another transfer case that is popular, all gear, very versatile, and easy to maintain, modify and upgrade. 

   At this time we offer a 2.72:1 Strong Box Shorty for the Early Bronco Dana 20. Measuring only 5.3" long, its a great way to adapt your Bronco Dana 20 to many modern transmissions. 

   Other versions that are compatible with the original C4, and even shorter than 5.3", will be available soon.

Early Bronco Dana 20

Strong Box Shorty

Call/Text 1(270) 287-8663      Email: Jacob@BehemothDrivetrain.com

​​    Our line of 2.72 Strong Boxes are designed to use gears from the following transfer cases:

NP241, NP243, NP246, NP231, NP233, NP236, and a few others that are very similar.  

   To use NV271 or NV273 gears in the 2.72:1 Strong Box Underdrive, you simply need to order your Strong Box specifically for NV271 or NV273 gears. We will make sure your Strong Box gear housing has the proper dimensions for NV271 / NV273. If you have already received a housing machined for NP241 or similar gears, we can modify it to accept NV271 / NV273 gears easily, and at no additional charge. You only pay shipping cost. NOTE: A NV271 / NV273 housing cannot be modified for NP241 or similar gears. 


Other cases that can be used, but may require slight modifications include:

 NP261, NP263, NP241 DLD, and a few others that are very similar.  Click Here to learn more about some of the required modifications to use these gear sets. 

    This allows the 2.72:1 Strong Box to be ordered with any of the following input shaft spline counts, making it compatible with many domestic transmissions:

  • 21 spline Jeep
  • 23 spline Jeep / Dodge
  • 24 spline Ford
  • 27 spline Chevy
  • 29 spline Dodge
  • 31 spline Ford
  • 32 spline Chevy
  • 34 spline Ford


Don't see the spline count that your transmission output requires?...

Keep looking on our site, we have other options available, and more to come. Feel free to Contact Us with your custom need. 

2.72:1 ​Early Bronco Dana 20 Strong Box Shorty DIY kit $699.00
​Pre-Assembly / Good, Used Gears $300.00