NV271 Standard Strongbox d3rearoutputoption or you can upgrade to

or you can upgrade to the JB Conversions 4:1 LowMax gear set to get the most unbeatable

NP243 and NP246 series gears

Combine your Colossus with a Behemoth Strongbox to get an unbeatable 4 speed case

The Helix IL has been tested with motor input speeds up to 13

It also features  oiling holes drilled into the shaft just like later aftermarket NP205 rear output shafts

NV271 Standard Strongbox d3rearoutputoption or you can upgrade toThe DIY NV271 Standard Strongbox underdrive by Behemoth Drivetrain is engineered for extreme strength, low weight, and incredible performance. We offer both a fully geared, assembled and ready to install model, AND a DIY builder's model that is case only allowing you to use and install your own gears. Gear Compatibility: The NV271 Standard Strongbox DIY case is designed to be compatible with NV271 and NV273 series gears. These cases do not work with