The Advance Adapters Atlas 4 speed has essentially two parts. The first is the reduction housing This housing holds a 6 gear planetary assembly that has a low range of 2.72:1 and a 1:1 in high range. We use a planetary assembly that was originally run in a NP241-HD transfer case. This assembly has been rated to withstand 5,555 ft/lb of torque and up to 11,000 lbs gross vehicle weight.
The second part of the 4 speed may look the same as the standard 2 speed Atlas, but it does have some differences. The main case of the 4 speed is the same raw casting, but has some machining variations to make it into a 4 speed. The main case functions independently from the front reduction housing and retains all of the normal Atlas features.
When all this is put together, you get a new legendary Atlas transfer case with the best combination of gear ratios ( 1:1, 2.0:1, 2.7:1 & 5.4:1 ) or ( 1.1, 2.7:1, 3.8:1 & 10.3:1 ).
The Atlas 2 speed and 4 speed transfer cases is sure to bring you the utmost in dependability and performance with the best warranty in the industry. The Atlas transfer cases are guaranteed against defects in workmanship and materials for the life of the original purchaser. This lifetime guarantee covers and is limited to gear sets and castings. The remainder of the unit is covered by their limited 1 year warranty.
