Standard Length Strong Box Underdrive for Full Size Fords, Using BW Gears
This 2.7:1 Strong Box can be ordered to use either BW1356 gears, or BW4406 / BW4407 gears. Either version is 8.2" long X 7.9" diameter, and weighs about 40 lbs. It is argued that the BW gears are just as strong, or stronger than the NP and NV planetary gears.
The advantage to using the BW gears mainly applies to those who are building a Full Size Ford drivetrain. While the NV271 / NV273 can work great in our 2.72:1 Strong Box, they can be expensive or difficult to locate. We find that many full size Ford enthusiasts can locate BW cases 15:1 over the NV cases with the 31 spline Ford input shaft option.
With all of the same great clocking, shifting, and strength qualities as our other Strong Box versions, it's an obvious choice for someone with access to BW gears.
4340 alloy steel is mainly used for manufacturing landing gear for heavy aircraft. Our 4340 thru hardened shafts come with a Limited Lifetime Warranty against breakage.
We use a rear bearing to support the output shaft, and keep all components concentric.
This Strong Box is 31 spline Ford input and 31 spline Ford output.