The Blackbox Series is NorthWest FabWorks premier line of shiftable,
underdrive gearboxes. Typically mounted
between the transmission and transfer case, the BlackBox is a gear reduction
unit that has the ability to shift from a 2.72:1 low range back to 1:1 for
Released in 2005, our original Blackbox set the benchmark
for advanced planetary technology. Since then, the original BlackBox has
evolved into a complete product line with dozens of application combinations. The BlackBox offers a gearing solution for everyone;
from the weekend warrior, to a top truck challenger.
Going from a vehicle with a stock, or single transfer case
will see a massive improvement when adding the BlackBox. Remember the control and traction you gained
from that first locker, or set of new M/T tires when you first started
out? That is the type of substantial
increase in capability you can expect after installing a BlackBox.
Operating a vehicle with the right gearing, and thus RPM and
wheel speed for the terrain at hand is key; too low of a crawl ratio and your
engine is revving high, but the reduction is too deep and you may not build
enough momentum to pop up over that rock face or ledge. Too tall, or not enough gear reduction, and the
lack of control leaves you with no choice but to try to bounce off obstacles at
Having an extremely low crawl ratio isn’t the key goal; the
ideal 4x4 has not only low gears, but gearing OPTIONS. Let’s dive into that next...
right gear, at the right time:
Re-gearing your axles for larger tires can be necessity for drive-ability, however installing an axle ratio too low for your engine/tire
size can leave your engine screaming on the highway to the trail, however still
not offering any real substantial gear reduction.
New Transfer case gears:
The final choice, the BlackBox:
Adding the blackbox not only offers the 2.72:1 low range,
but has the ability to multiply against your existing transfer case low range
offering 4 total low range options.
Lets use a NP205 for a gear ratio example
BlackBox & Transfer Case in High range: 1:1, no
BlackBox in high, Transfer case in low, ex:
BlackBox in Low, Transfer Case in High, 2.72:1
Blackbox and Transfer case in Low 5.33:1 comound low. (2.72:1x1.96:1)
BlackBox: Original, The classic that started it all.
BlackBox-i: Integrated version, as short as 4” with no
drawbacks, fits Dana 300, Bronco Dana 20 and Atlas II.
BlackBox-C: Land Cruiser Edition: All the strength and
technology of the original, now Landcruiser specific.
BlackBox – TITAN: The absolute ultimate in strength, NP205 specific.
Eco-Crawl: A DIY builder version. BlackBox technology on a budget.
BlackBox Warranty Information