Operation:
Since the 4SP has a reduction housing in front of the main case, each low range is controlled independently from the other. The front reduction unit can be selected to “low” and the main case selected in “high” giving a 2.72 reduction.
The main case can have one of two different low range ratios. The current prototype is a 3.8 reduction, and we will also be offering a 2.0 for the production units. When the front housing is in “high” range and the main case is in “low”, our prototype has a 3.8 reduction. For the ultimate low, run both the front housing and the main case in low range to give you a 10.3 reduction! With the ability to run three seperate low range options, one vehicle can be well suited to run sand, mud, trail, and super low rock crawling.
Strength:
The strength of this unit is not an issue. Advance Adapters uses a planetary assembly that was originally run in a NP241-HD transfer case. This assembly has been rated to withstand 5,555 ft./lbs. of torque, and up to 11,000 lbs. gross vehicle weight. The six planetary setup has proven its durability and has been used in countless heavy-duty vehicles. Other attributes to the planetary assembly include a very quiet operation, easy shifting, and low rolling resistance. When all of this is put in front of a legendary Atlas Transfer Case, you get the best combination of gear
ratios and reliability.